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/f/factor.go

@@ -6,14 +6,18 @@ import (
 )
 
 // Factor lexer.
-var Factor = internal.Register(MustNewLexer(
+var Factor = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Factor",
 		Aliases:   []string{"factor"},
 		Filenames: []string{"*.factor"},
 		MimeTypes: []string{"text/x-factor"},
 	},
-	Rules{
+	factorRules,
+))
+
+func factorRules() Rules {
+	return Rules{
 		"root": {
 			{`#!.*$`, CommentPreproc, nil},
 			Default(Push("base")),
@@ -111,5 +115,5 @@ var Factor = internal.Register(MustNewLexer(
 			{`;\s`, Keyword, Pop(1)},
 			{`\S+`, NameFunction, nil},
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/f/fish.go

@@ -6,14 +6,18 @@ import (
 )
 
 // Fish lexer.
-var Fish = internal.Register(MustNewLexer(
+var Fish = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "Fish",
 		Aliases:   []string{"fish", "fishshell"},
 		Filenames: []string{"*.fish", "*.load"},
 		MimeTypes: []string{"application/x-fish"},
 	},
-	Rules{
+	fishRules,
+))
+
+func fishRules() Rules {
+	return Rules{
 		"root": {
 			Include("basic"),
 			Include("data"),
@@ -61,5 +65,5 @@ var Fish = internal.Register(MustNewLexer(
 			{`\d+`, LiteralNumber, nil},
 			Include("root"),
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/f/forth.go

@@ -6,7 +6,7 @@ import (
 )
 
 // Forth lexer.
-var Forth = internal.Register(MustNewLexer(
+var Forth = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Forth",
 		Aliases:         []string{"forth"},
@@ -14,7 +14,11 @@ var Forth = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"application/x-forth"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	forthRules,
+))
+
+func forthRules() Rules {
+	return Rules{
 		"root": {
 			{`\s+`, Text, nil},
 			{`\\.*?\n`, CommentSingle, nil},
@@ -36,5 +40,5 @@ var Forth = internal.Register(MustNewLexer(
 		"stringdef": {
 			{`[^"]+`, LiteralString, Pop(1)},
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/f/fortran.go

@@ -6,7 +6,7 @@ import (
 )
 
 // Fortran lexer.
-var Fortran = internal.Register(MustNewLexer(
+var Fortran = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "Fortran",
 		Aliases:         []string{"fortran"},
@@ -14,7 +14,11 @@ var Fortran = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-fortran"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	fortranRules,
+))
+
+func fortranRules() Rules {
+	return Rules{
 		"root": {
 			{`^#.*\n`, CommentPreproc, nil},
 			{`!.*\n`, Comment, nil},
@@ -43,5 +47,5 @@ var Fortran = internal.Register(MustNewLexer(
 			{`[+-]?\d*\.\d+([ed][-+]?\d+)?(_[a-z]\w+)?`, LiteralNumberFloat, nil},
 			{`[+-]?\d+\.\d*([ed][-+]?\d+)?(_[a-z]\w+)?`, LiteralNumberFloat, nil},
 		},
-	},
-))
+	}
+}

vendor/github.com/alecthomas/chroma/lexers/f/fsharp.go

@@ -6,14 +6,18 @@ import (
 )
 
 // Fsharp lexer.
-var Fsharp = internal.Register(MustNewLexer(
+var Fsharp = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:      "FSharp",
 		Aliases:   []string{"fsharp"},
 		Filenames: []string{"*.fs", "*.fsi"},
 		MimeTypes: []string{"text/x-fsharp"},
 	},
-	Rules{
+	fsharpRules,
+))
+
+func fsharpRules() Rules {
+	return Rules{
 		"escape-sequence": {
 			{`\\[\\"\'ntbrafv]`, LiteralStringEscape, nil},
 			{`\\[0-9]{3}`, LiteralStringEscape, nil},
@@ -90,5 +94,5 @@ var Fsharp = internal.Register(MustNewLexer(
 			{`"""B?`, LiteralString, Pop(1)},
 			{`"`, LiteralString, nil},
 		},
-	},
-))
+	}
+}