Fix team ID for model-transparency-codeowners (#421)

I did a copy-paste-and-forget error yesterday, I didn't remember to also
update the team id number. This is why we could not merge PRs in the
repo after approval (I think).

Team ID taken from going to
https://github.com/orgs/sigstore/teams/model-transparency-codeowners and
looking at the URL for the avatar
(https://avatars.githubusercontent.com/t/9730895?s=116&v=4).

Signed-off-by: Mihai Maruseac <mihaimaruseac@google.com>

github-sync/github-data/sigstore/repositories.yaml

@@ -962,7 +962,7 @@ repositories:
     collaborators: []
     teams:
       - name: model-transparency-codeowners
-        id: 4722047
+        id: 9730895
         permission: admin
     branchesProtection:
       - pattern: main