ci: Test with Go 1.23 and 1.24 (#502)

In CI, test with Go 1.23 and 1.24,
and upgrade the Hermit-managed Go and golangci-lint to latest versions.

The new golangci-lint had a number of warnings and minor issues
that were either fixed or opted-out of.

resolver.go

@@ -63,6 +63,6 @@ func JSON(r io.Reader) (Resolver, error) {
 }
 
 func snakeCase(name string) string {
-	name = strings.Join(strings.Split(strings.Title(name), "-"), "")
+	name = strings.Join(strings.Split(strings.Title(name), "-"), "") //nolint:staticcheck // Unicode punctuation not an issue
 	return strings.ToLower(name[:1]) + name[1:]
 }