feat: update to go modules

vendor/github.com/alecthomas/chroma/lexers/c/cheetah.go

@@ -1,37 +0,0 @@
-package c
-
-import (
-	. "github.com/alecthomas/chroma" // nolint
-	"github.com/alecthomas/chroma/lexers/internal"
-	. "github.com/alecthomas/chroma/lexers/p" // nolint
-)
-
-// Cheetah lexer.
-var Cheetah = internal.Register(MustNewLexer(
-	&Config{
-		Name:      "Cheetah",
-		Aliases:   []string{"cheetah", "spitfire"},
-		Filenames: []string{"*.tmpl", "*.spt"},
-		MimeTypes: []string{"application/x-cheetah", "application/x-spitfire"},
-	},
-	Rules{
-		"root": {
-			{`(##[^\n]*)$`, ByGroups(Comment), nil},
-			{`#[*](.|\n)*?[*]#`, Comment, nil},
-			{`#end[^#\n]*(?:#|$)`, CommentPreproc, nil},
-			{`#slurp$`, CommentPreproc, nil},
-			{`(#[a-zA-Z]+)([^#\n]*)(#|$)`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
-			{`(\$)([a-zA-Z_][\w.]*\w)`, ByGroups(CommentPreproc, Using(Python)), nil},
-			{`(\$\{!?)(.*?)(\})(?s)`, ByGroups(CommentPreproc, Using(Python), CommentPreproc), nil},
-			{`(?sx)
-                (.+?)               # anything, followed by:
-                (?:
-                 (?=\#[#a-zA-Z]*) | # an eval comment
-                 (?=\$[a-zA-Z_{]) | # a substitution
-                 \Z                 # end of string
-                )
-            `, Other, nil},
-			{`\s+`, Text, nil},
-		},
-	},
-))