fix: remove dead nolint:gosec suppressions added for a stale toolchain

The 15 //nolint:gosec G703/G704 directives added in 13e9f2c suppressed
findings that only a stale local golangci-lint (v2.10.1) reports; the
repo's pinned golangci-lint:v2.12.2-alpine never raises gosec G703/G704
on these lines, so nolintlint correctly flagged every directive as an
unused suppression and failed the pinned lint build.

Verified with the authoritative docker build --target lint . using the
pinned image, and separately with a locally installed pinned v2.12.2
binary: both report 0 issues after removal.

internal/imgcache/storage.go

@@ -94,23 +94,22 @@ func (s *ContentStorage) Store(r io.Reader) (ContentHash, int64, error) {
 	_, err = tmpFile.Write(data)
 	if err != nil {
 		_ = tmpFile.Close()
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return "", 0, fmt.Errorf("failed to write content: %w", err)
 	}
 
 	err = tmpFile.Close()
 	if err != nil {
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return "", 0, fmt.Errorf("failed to close temp file: %w", err)
 	}
 
 	// Atomic rename
-	//nolint:gosec // G703: tmp file is ours, path is derived from content hash
 	err = os.Rename(filepath.Clean(tmpPath), filepath.Clean(path))
 	if err != nil {
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return "", 0, fmt.Errorf("failed to rename temp file: %w", err)
 	}
@@ -254,23 +253,22 @@ func (s *MetadataStorage) Store(
 	_, err = tmpFile.Write(data)
 	if err != nil {
 		_ = tmpFile.Close()
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return fmt.Errorf("failed to write metadata: %w", err)
 	}
 
 	err = tmpFile.Close()
 	if err != nil {
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return fmt.Errorf("failed to close temp file: %w", err)
 	}
 
 	// Atomic rename
-	//nolint:gosec // G703: tmp file is ours, path is derived from cache key
 	err = os.Rename(filepath.Clean(tmpPath), filepath.Clean(path))
 	if err != nil {
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return fmt.Errorf("failed to rename temp file: %w", err)
 	}
@@ -412,23 +410,22 @@ func (s *VariantStorage) Store(
 	_, err = tmpFile.Write(data)
 	if err != nil {
 		_ = tmpFile.Close()
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return 0, fmt.Errorf("failed to write content: %w", err)
 	}
 
 	err = tmpFile.Close()
 	if err != nil {
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return 0, fmt.Errorf("failed to close temp file: %w", err)
 	}
 
 	// Atomic rename content
-	//nolint:gosec // G703: tmp file is ours, path is derived from cache key
 	err = os.Rename(filepath.Clean(tmpPath), filepath.Clean(path))
 	if err != nil {
-		_ = os.Remove(tmpPath) //nolint:gosec // G703: our own temp file, not user input
+		_ = os.Remove(tmpPath)
 
 		return 0, fmt.Errorf("failed to rename temp file: %w", err)
 	}