Fix treefmt errors introduced in #156

Signed-off-by: magic_rb <richard@brezak.sk>

Author: MagicRB

buildbot_nix/github_projects.py

@@ -572,7 +572,7 @@ def load_projects(self) -> list["GitProject"]:
 
         if isinstance(self.auth_backend, GithubAppAuthBackend):
             dropped_repos = list(
-                filter(lambda repo: not "installation_id" in repo, repos)
+                filter(lambda repo: "installation_id" not in repo, repos)
             )
             if dropped_repos:
                 tlog.info(
@@ -611,7 +611,7 @@ def are_projects_cached(self) -> bool:
 
         all_have_installation_id = True
         for project in json.loads(self.config.project_cache_file.read_text()):
-            if not "installation_id" in project:
+            if "installation_id" not in project:
                 all_have_installation_id = False
                 break