Add retries to commit status API requests (#151)

Recently we've been seeing some `422` error codes returned for our HTTP
requests to the [_Create a commit
status_](https://docs.github.com/en/rest/commits/statuses?apiVersion=2022-11-28#create-a-commit-status)
endpoint.

The associated error message indicates that we've hit a limit on the
statuses for a particular SHA in a given repository.

After analyzing the logs, it doesn't appear that we're _actually_
reaching the limits described by the endpoint.

Therefore we've concluded that it could be an issue on GitHub's end that
can be resolved by simply retrying the requests.

This PR adds a retry configuration for our `createCommitStatus` calls.

It will retry 3 times, waiting 10 seconds between each retry.

This retry configuration is described here:
https://github.com/octokit/plugin-retry.js/blob/main/README.md?plain=1#L79

src/shared.ts

@@ -83,6 +83,10 @@ export const createSetCommitStatus = (
       state,
       description,
       target_url,
+      request: {
+        retries: 3,
+        retryAfter: 10,
+      },
     });
   };
 };