feedback: fix unused var style

Author: dmcilvaney

.github/workflows/scripts/check_rendered_specs.py

@@ -76,7 +76,7 @@ def _resolve_head_blobs(paths: list[str]) -> dict[str, str]:
         # Format: "<mode> <type> <sha>\t<path>"
         meta, _, path = entry.partition("\t")
         try:
-            _mode, kind, sha = meta.split(" ")
+            _, kind, sha = meta.split(" ")
         except ValueError:
             continue
         if kind != "blob":