Change precommit autoupdate frequency to monthly (#33)

* [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/pre-commit/mirrors-mypy: v1.5.1 → v1.6.0](pre-commit/mirrors-mypy@v1.5.1...v1.6.0)

* Update .pre-commit-config.yaml

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.pre-commit-config.yaml

@@ -1,3 +1,5 @@
+ci:
+  autoupdate_schedule: "monthly"
 repos:
   - repo: https://github.com/psf/black
     rev: 23.9.1
@@ -9,7 +11,7 @@ repos:
         types: [python]
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.5.1
+    rev: v1.6.0
     hooks:
       - id: mypy
         exclude: ^docs/conf.py