move typecheck to CI, bump pre-commit

Author: khvn26

.github/workflows/pytest.yml

@@ -32,5 +32,16 @@ jobs:
           pip install poetry
           poetry install --with dev
 
+      # mypy doesn't support Python 3.8, so we run it only for 3.9 and above.
+      # Still check for typing errors for Python 3.8 when running against one of the newer versions.
+      # See https://mypy.readthedocs.io/en/stable/changelog.html#drop-support-for-python-3-8.
+      - name: Check for new typing errors for Python 3.8
+        if: ${{ matrix.python-version == '3.9' }}
+        run: poetry run mypy --strict --python-version 3.8 .
+
+      - name: Check for new typing errors
+        if: ${{ matrix.python-version != '3.8' }}
+        run: poetry run mypy --strict .
+
       - name: Run Tests
         run: poetry run pytest

.pre-commit-config.yaml

@@ -1,11 +1,4 @@
 repos:
-  - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.16.1
-    hooks:
-      - id: mypy
-        args: [--strict]
-        additional_dependencies:
-          [pydantic, pytest, pytest_mock, types-requests, flagsmith-flag-engine, responses, sseclient-py]
   - repo: https://github.com/PyCQA/isort
     rev: 6.0.1
     hooks: