fix typo

Author: Mic92

buildbot_nix/buildbot_nix/gitea_projects.py

@@ -155,7 +155,7 @@ def create_reporter(self) -> ReporterBase:
     def create_change_hook(self) -> dict[str, Any]:
         return {
             "secret": self.config.webhook_secret,
-            # The "mergable" field is a bit buggy,
+            # The "mergeable" field is a bit buggy,
             # we already do the merge locally anyway.
             "onlyMergeablePullRequest": False,
         }