Update .pre-commit-config.yaml (PyPSA#1659)

Author: lkstrp

.pre-commit-config.yaml

@@ -3,6 +3,9 @@
 # SPDX-License-Identifier: CC0-1.0
 exclude: "^LICENSES"
 
+ci:
+  autoupdate_schedule: monthly
+
 repos:
 - repo: https://github.com/pre-commit/pre-commit-hooks
   rev: v5.0.0