Squashed commit of the following:

commit 95479c8ad744db48386a5c78e54ef8da80e9120b
Author: Chris Lane <chris@chris-allen-lane.com>
Date:   Wed Apr 28 12:26:32 2021 -0400

    chore(version): bump version to 4.2.1

commit 6956f51cae
Author: Chris Lane <chris@chris-allen-lane.com>
Date:   Wed Apr 28 12:24:21 2021 -0400

    fix(Makefile): `vendor-update`

    Update the `vendor-update` build target to run `go mod vendor` after
    updating dependencies.

commit 0aca411279
Author: Chris Lane <chris@chris-allen-lane.com>
Date:   Wed Apr 28 12:23:24 2021 -0400

    chore(deps): update dependencies

commit e847956b02
Author: Chris Lane <chris@chris-allen-lane.com>
Date:   Wed Apr 28 08:26:51 2021 -0400

    chore(deps): build updates

    - Upgrade `go` to `1.16.3`

    - Attempt to fix build errors regarding dependencies

vendor/github.com/alecthomas/chroma/lexers/o/objectivec.go

@@ -6,14 +6,18 @@ import (
 )
 
 // Objective-C lexer.
-var ObjectiveC = internal.Register(MustNewLexer(
+var ObjectiveC = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Objective-C",
 		Aliases:   []string{"objective-c", "objectivec", "obj-c", "objc"},
 		Filenames: []string{"*.m", "*.h"},
 		MimeTypes: []string{"text/x-objective-c"},
 	},
-	Rules{
+	objectiveCRules,
+))
+
+func objectiveCRules() Rules {
+	return Rules{
 		"statements": {
 			{`@"`, LiteralString, Push("string")},
 			{`@(YES|NO)`, LiteralNumber, nil},
@@ -161,5 +165,5 @@ var ObjectiveC = internal.Register(MustNewLexer(
 			{`^\s*#endif.*?(?<!\\)\n`, CommentPreproc, Pop(1)},
 			{`.*?\n`, Comment, nil},
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/o/ocaml.go

@@ -6,14 +6,18 @@ import (
 )
 
 // Ocaml lexer.
-var Ocaml = internal.Register(MustNewLexer(
+var Ocaml = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "OCaml",
 		Aliases:   []string{"ocaml"},
 		Filenames: []string{"*.ml", "*.mli", "*.mll", "*.mly"},
 		MimeTypes: []string{"text/x-ocaml"},
 	},
-	Rules{
+	ocamlRules,
+))
+
+func ocamlRules() Rules {
+	return Rules{
 		"escape-sequence": {
 			{`\\[\\"\'ntbr]`, LiteralStringEscape, nil},
 			{`\\[0-9]{3}`, LiteralStringEscape, nil},
@@ -62,5 +66,5 @@ var Ocaml = internal.Register(MustNewLexer(
 			{`[a-z_][\w\']*`, Name, Pop(1)},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/o/octave.go

@@ -6,14 +6,18 @@ import (
 )
 
 // Octave lexer.
-var Octave = internal.Register(MustNewLexer(
+var Octave = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Octave",
 		Aliases:   []string{"octave"},
 		Filenames: []string{"*.m"},
 		MimeTypes: []string{"text/octave"},
 	},
-	Rules{
+	octaveRules,
+))
+
+func octaveRules() Rules {
+	return Rules{
 		"root": {
 			{`[%#].*$`, Comment, nil},
 			{`^\s*function`, Keyword, Push("deffunc")},
@@ -42,5 +46,5 @@ var Octave = internal.Register(MustNewLexer(
 			{`(\s*)(?:(.+)(\s*)(=)(\s*))?(.+)(\()(.*)(\))(\s*)`, ByGroups(TextWhitespace, Text, TextWhitespace, Punctuation, TextWhitespace, NameFunction, Punctuation, Text, Punctuation, TextWhitespace), Pop(1)},
 			{`(\s*)([a-zA-Z_]\w*)`, ByGroups(Text, NameFunction), Pop(1)},
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/o/openscad.go

@@ -5,14 +5,18 @@ import (
 	"github.com/alecthomas/chroma/lexers/internal"
 )
 
-var OpenSCAD = internal.Register(MustNewLexer(
+var OpenSCAD = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "OpenSCAD",
 		Aliases:   []string{"openscad"},
 		Filenames: []string{"*.scad"},
 		MimeTypes: []string{"text/x-scad"},
 	},
-	Rules{
+	openSCADRules,
+))
+
+func openSCADRules() Rules {
+	return Rules{
 		"root": {
 			{`[^\S\n]+`, Text, nil},
 			{`\n`, Text, nil},
@@ -39,5 +43,5 @@ var OpenSCAD = internal.Register(MustNewLexer(
 			{"(<)([^>]*)(>)", ByGroups(Punctuation, CommentPreprocFile, Punctuation), nil},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/o/org.go

@@ -6,14 +6,18 @@ import (
 )
 
 // Org mode lexer.
-var Org = internal.Register(MustNewLexer(
+var Org = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Org Mode",
 		Aliases:   []string{"org", "orgmode"},
 		Filenames: []string{"*.org"},
 		MimeTypes: []string{"text/org"}, // https://lists.gnu.org/r/emacs-orgmode/2017-09/msg00087.html
 	},
-	Rules{
+	orgRules,
+))
+
+func orgRules() Rules {
+	return Rules{
 		"root": {
 			{`^# .*$`, Comment, nil},
 			// Headings
@@ -45,7 +49,8 @@ var Org = internal.Register(MustNewLexer(
 			// - Comment Blocks
 			{`(?i)^( *#\+begin_comment *\n)([\w\W]*?)(^ *#\+end_comment *$)`, ByGroups(Comment, Comment, Comment), nil},
 			// - Src Blocks
-			{`(?i)^( *#\+begin_src )([^ \n]+)(.*?\n)([\w\W]*?)(^ *#\+end_src *$)`,
+			{
+				`(?i)^( *#\+begin_src )([^ \n]+)(.*?\n)([\w\W]*?)(^ *#\+end_src *$)`,
 				UsingByGroup(
 					internal.Get,
 					2, 4,
@@ -54,7 +59,8 @@ var Org = internal.Register(MustNewLexer(
 				nil,
 			},
 			// - Export Blocks
-			{`(?i)^( *#\+begin_export )(\w+)( *\n)([\w\W]*?)(^ *#\+end_export *$)`,
+			{
+				`(?i)^( *#\+begin_export )(\w+)( *\n)([\w\W]*?)(^ *#\+end_export *$)`,
 				UsingByGroup(
 					internal.Get,
 					2, 4,
@@ -98,5 +104,5 @@ var Org = internal.Register(MustNewLexer(
 			// Any other text
 			{`.`, Text, nil},
 		},
-	},
-))
+	}
+}