Add Commit.get_pulls() to pyi (#1958)

Commit.get_pulls() is missing from the typing information, add it.

Author: atakiya

github/Commit.pyi

@@ -11,6 +11,7 @@ from github.GitCommit import GitCommit
 from github.GithubObject import CompletableGithubObject, _NotSetType
 from github.NamedUser import NamedUser
 from github.PaginatedList import PaginatedList
+from github.PullRequest import PullRequest
 
 class Commit(CompletableGithubObject):
     def __repr__(self) -> str: ...
@@ -50,6 +51,7 @@ class Commit(CompletableGithubObject):
     def get_combined_status(self) -> CommitCombinedStatus: ...
     def get_comments(self) -> PaginatedList[CommitComment]: ...
     def get_statuses(self) -> PaginatedList[CommitStatus]: ...
+    def get_pulls(self) -> PaginatedList[PullRequest]: ...
     def get_check_runs(
         self,
         check_name: Union[_NotSetType, str] = ...,