Fix mypy error in run_release.py

Author: ezio-melotti

run_release.py

@@ -27,7 +27,7 @@
 import aiohttp
 import gnupg  # type: ignore[import-untyped]
 import paramiko
-import sigstore.oidc  # type: ignore[import-untyped]
+import sigstore.oidc
 from alive_progress import alive_bar  # type: ignore[import-untyped]
 
 import release as release_mod