Run mypy --strict during pre-commit.

Also see python/mypy#13916

Author: kbsriram

.pre-commit-config.yaml

@@ -17,6 +17,17 @@ repos:
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.10.0
+    hooks:
+      - id: mypy
+        args:
+          - --strict
+          - adafruit_pioasm.py
+          - tests
+        pass_filenames: false
+        additional_dependencies:
+          - pytest
   - repo: https://github.com/pycqa/pylint
     rev: v2.17.4
     hooks: