chore: modernize the codebase using go 1.26 (#278)

This runs:

```
go run golang.org/x/tools/gopls/internal/analysis/modernize/cmd/modernize@latest -fix ./...
```

over the codebase, as this is using go 1.26, it can also use the new
new() functionallity so AsPtr and boolPtr is are needed anymore.

Signed-off-by: Miek Gieben <miek@miek.nl>

internal/cli/flags.go

@@ -20,7 +20,7 @@ func ExpandCommaSeparatedValues(values []string) []string {
 
 	var expanded []string
 	for _, value := range values {
-		for _, v := range strings.Split(value, ",") {
+		for v := range strings.SplitSeq(value, ",") {
 			if v = strings.TrimSpace(v); v != "" {
 				expanded = append(expanded, v)
 			}