chore(lint): bump golangci-lint to v2.11.1 (#7905)

- Added nolint to plugin/auto/walk.go to avoid a symlink/TOCTOU
  warning, as it needs to follow symlink.
- Replaced a few flagged integer conversions with safe equivalents in
  cache hashing, reuseport socket setup, and TLS arg handling
- Preallocated response rule slices in plugin/rewrite/name.go
- Replaced WriteString(fmt.Sprintf/Sprintln(...)) with direct
  fmt.Fprint* calls
- Removed stale nolint directives from code and tests that are no
  longer needed

Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>

plugin/auto/walk.go

@@ -39,7 +39,7 @@ func (a Auto) Walk() error {
 			return nil
 		}
 
-		reader, err := os.Open(filepath.Clean(path))
+		reader, err := os.Open(filepath.Clean(path)) //nolint:gosec // G122: path is from filepath.Walk rooted in a.directory; symlinks must be followed for configmap-style mounts
 		if err != nil {
 			log.Warningf("Opening %s failed: %s", path, err)
 			return nil