update_manager: fix linter errors

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

moonraker/components/update_manager/app_deploy.py

@@ -482,7 +482,7 @@ class AppDeploy(BaseDeploy):
             await self.cmd_helper.run_cmd(
                 f"virtualenv {self.venv_args} {env_path}", timeout=300.)
         except Exception:
-            self.log_exc(f"Error creating virtualenv")
+            self.log_exc("Error creating virtualenv")
             return
         if not self.py_exec.exists():
             raise self.log_exc("Failed to create new virtualenv", False)

moonraker/components/update_manager/git_deploy.py

@@ -1259,7 +1259,8 @@ class GitRepo:
                     # since the attept to repair failed, bypass retries
                     # and immediately raise an exception
                     raise self.server.error(
-                        f"Unable to repair loose objects, use hard recovery")
+                        "Unable to repair loose objects, use hard recovery"
+                    )
             retries -= 1
             await asyncio.sleep(.5)
             await self._check_lock_file_exists(remove=True)

moonraker/components/update_manager/system_deploy.py

@@ -422,7 +422,7 @@ class PackageKitTransaction:
                                  status_code: int,
                                  percent_complete: int
                                  ) -> None:
-        status = PkEnum.Status.from_index(status_code)
+        status = PkEnum.Status.from_index(status_code)  # noqa: F841
         # NOTE: This signal doesn't seem to fire predictably,
         # nor does it seem to provide a consistent "percent complete"
         # parameter.