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/v/vb.go

@@ -8,7 +8,7 @@ import (
 const vbName = `[_\w][\w]*`
 
 // VB.Net lexer.
-var VBNet = internal.Register(MustNewLexer(
+var VBNet = internal.Register(MustNewLazyLexer(
 	&Config{
 		Name:            "VB.net",
 		Aliases:         []string{"vb.net", "vbnet"},
@@ -16,7 +16,11 @@ var VBNet = internal.Register(MustNewLexer(
 		MimeTypes:       []string{"text/x-vbnet", "text/x-vba"},
 		CaseInsensitive: true,
 	},
-	Rules{
+	vbNetRules,
+))
+
+func vbNetRules() Rules {
+	return Rules{
 		"root": {
 			{`^\s*<.*?>`, NameAttribute, nil},
 			{`\s+`, Text, nil},
@@ -69,5 +73,5 @@ var VBNet = internal.Register(MustNewLexer(
 			{`(Function|Sub|Property|Class|Structure|Enum|Module|Namespace)\b`, Keyword, Pop(1)},
 			Default(Pop(1)),
 		},
-	},
-))
+	}
+}