Pin GitHub REST API version in requests

Previously, the requests would use whatever version of the API is current, exposing the action to immediate breakage if
GitHub released a new version of the REST API with relevant changes.

GitHub provides the previous API for a minimum of 24 months after a new version is released, so pinning the REST API
version used by the action via the `X-GitHub-Api-Version` HTTP header improves the stability of the action and allows
the project maintainer to make a controlled migration to the new API version.

Author: per1234

Diff for: reportsizedeltas/reportsizedeltas.py

@@ -630,6 +630,7 @@ def raw_http_request(self, url: str, data: bytes | None = None):
             "Authorization": "Bearer " + self.token,
             # GitHub recommends using user name as User-Agent (https://developer.github.com/v3/#user-agent-required)
             "User-Agent": self.repository_name.split("/")[0],
+            "X-GitHub-Api-Version": "2022-11-28",
         }
         request = urllib.request.Request(url=url, headers=headers, data=data)
 

Diff for: reportsizedeltas/tests/test_reportsizedeltas.py

@@ -893,6 +893,7 @@ def test_raw_http_request(mocker):
             "Accept": "application/vnd.github+json",
             "Authorization": "Bearer " + token,
             "User-Agent": user_name,
+            "X-GitHub-Api-Version": "2022-11-28",
         },
         data=data,
     )