fix(S21/T01): fix all lint warnings and upgrade wsl to wsl_v5

Files:
- .golangci.yml
- backend/events/cmd/genevents/main.go
- backend/fileutil/atomicwrite_test.go
- backend/library/library.go
- backend/player/buffered_streamer_test.go
- backend/player/player.go
- backend/tagwriter/dbsync.go
- backend/tagwriter/mp3_test.go
- backend/tagwriter/ogg.go
- backend/tagwriter/ogg_test.go
- backend/tagwriter/ogg_vorbis.go
- backend/tagwriter/pipeline.go
- backend/tagwriter/tagwriter.go
- backend/tagwriter/wav_test.go

backend/tagwriter/dbsync.go

@@ -514,6 +514,7 @@ func generateSizedVariants(logger *slog.Logger, imgData []byte, dir, hashStr str
 	src, _, err := image.Decode(bytes.NewReader(imgData))
 	if err != nil {
 		logger.Warn("could not decode image for thumbnails", "err", err)
+
 		return
 	}
 
@@ -537,6 +538,7 @@ func generateSizedVariants(logger *slog.Logger, imgData []byte, dir, hashStr str
 		var buf bytes.Buffer
 		if encErr := jpeg.Encode(&buf, dst, &jpeg.Options{Quality: tier.quality}); encErr != nil {
 			logger.Warn("could not encode thumbnail", "tier", tier.suffix, "err", encErr)
+
 			continue
 		}