feat: update to go modules

vendor/github.com/alecthomas/chroma/lexers/p/pacman.go

@@ -1,26 +0,0 @@
-package p
-
-import (
-	. "github.com/alecthomas/chroma" // nolint
-	"github.com/alecthomas/chroma/lexers/internal"
-)
-
-// Pacmanconf lexer.
-var Pacmanconf = internal.Register(MustNewLexer(
-	&Config{
-		Name:      "PacmanConf",
-		Aliases:   []string{"pacmanconf"},
-		Filenames: []string{"pacman.conf"},
-		MimeTypes: []string{},
-	},
-	Rules{
-		"root": {
-			{`#.*$`, CommentSingle, nil},
-			{`^\s*\[.*?\]\s*$`, Keyword, nil},
-			{`(\w+)(\s*)(=)`, ByGroups(NameAttribute, Text, Operator), nil},
-			{`^(\s*)(\w+)(\s*)$`, ByGroups(Text, NameAttribute, Text), nil},
-			{Words(``, `\b`, `$repo`, `$arch`, `%o`, `%u`), NameVariable, nil},
-			{`.`, Text, nil},
-		},
-	},
-))