Get branches where commit is head (PyGithub#3083)

Implements `GET
/repos/{owner}/{repo}/commits/{commit_sha}/branches-where-head`

https://docs.github.com/rest/commits/commits#list-branches-for-head-commit

github/Commit.py

@@ -47,6 +47,7 @@
 
 from typing import TYPE_CHECKING, Any
 
+import github.Branch
 import github.CheckRun
 import github.CheckSuite
 import github.CommitCombinedStatus
@@ -61,6 +62,7 @@
 from github.PaginatedList import PaginatedList
 
 if TYPE_CHECKING:
+    from github.Branch import Branch
     from github.CheckRun import CheckRun
     from github.CheckSuite import CheckSuite
     from github.CommitCombinedStatus import CommitCombinedStatus
@@ -206,6 +208,13 @@ def create_status(
         )
         return github.CommitStatus.CommitStatus(self._requester, headers, data)
 
+    def get_branches_where_head(self) -> list[Branch]:
+        """
+        :calls: `GET /repos/{owner}/{repo}/commits/{commit_sha}/branches-where-head <https://docs.github.com/rest/commits/commits#list-branches-for-head-commit>`_
+        """
+        headers, data = self._requester.requestJsonAndCheck("GET", f"{self.url}/branches-where-head")
+        return [github.Branch.Branch(self._requester, headers, item) for item in data]
+
     def get_comments(self) -> PaginatedList[CommitComment]:
         """
         :calls: `GET /repos/{owner}/{repo}/commits/{sha}/comments <https://docs.github.com/en/rest/reference/repos#comments>`_

tests/Commit.py

@@ -85,6 +85,15 @@ def testAttributes(self):
             'Commit(sha="1292bf0e22c796e91cc3d6e24b544aece8c21f2a")',
         )
 
+    def testGetBranchesWhereHead(self):
+        repo = self.g.get_repo("PyGithub/PyGithub")
+        commit = repo.get_commit("0791cc7b1a706ab5d7c607ddff35de4d486ba3e9")
+        self.assertListKeyEqual(
+            commit.get_branches_where_head(),
+            lambda b: b.name,
+            ["release-v2-0"],
+        )
+
     def testGetComments(self):
         self.assertListKeyEqual(
             self.commit.get_comments(),