Remove EOL Python 3.9 from Sigstore ID list

Author: hugovk

add_to_pydotorg.py

@@ -81,7 +81,6 @@ def run_cmd(
 
 # Update this list when new release managers are added.
 release_to_sigstore_identity_and_oidc_issuer = {
-    "3.9": ("lukasz@langa.pl", github_oidc_provider),
     "3.10": ("pablogsal@python.org", google_oidc_provider),
     "3.11": ("pablogsal@python.org", google_oidc_provider),
     "3.12": ("thomas@python.org", google_oidc_provider),