feat(pip-compile): lockFileMaintenance (#10408)

lib/manager/pip-compile/index.ts

@@ -4,7 +4,13 @@ export { extractPackageFile } from '../pip_requirements/extract';
 export { updateArtifacts } from './artifacts';
 
 export const language = LANGUAGE_PYTHON;
+export const supportsLockFileMaintenance = true;
 
 export const defaultConfig = {
   fileMatch: [],
+  lockFileMaintenance: {
+    enabled: true,
+    branchTopic: 'pip-compile-refresh',
+    commitMessageAction: 'Refresh pip-compile outputs',
+  },
 };