feat(gomod): punctuation, toolchain highlights

Reference file:

```gomod
module github.com/klauspost/reedsolomon

go 1.21

require github.com/klauspost/cpuid/v2 v2.2.8

require golang.org/x/sys v0.24.0 // indirect

retract (
	v1.12.2 // klauspost/reedsolomon#283
	v1.11.6 // klauspost/reedsolomon#240
	[v1.11.3, v1.11.5] // klauspost/reedsolomon#238
	v1.11.2 // klauspost/reedsolomon#229
)
```

queries/gomod/highlights.scm

@@ -17,4 +17,14 @@
 [
   (version)
   (go_version)
-] @string
+  (toolchain_name)
+] @string.special
+
+[
+  "("
+  ")"
+  "["
+  "]"
+] @punctuation.bracket
+
+"," @punctuation.delimiter