Run different version of mypy in ci

Author: UnknownPlatypus

.github/workflows/test.yml

@@ -25,6 +25,7 @@ jobs:
     strategy:
       matrix:
         python-version: ['3.10', '3.11', '3.12', '3.13']
+        mypy-version: ['1.13', '1.14', '1.15', 'latest']
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
@@ -38,6 +39,14 @@ jobs:
       - name: Install dependencies
         run: uv sync --no-dev --group tests
 
+      - name: Override mypy version
+        run: |
+          if [ "${{ matrix.mypy-version }}" == "latest" ]; then
+            uv pip install git+https://github.com/python/mypy.git@master
+          else
+            uv pip install mypy==${{ matrix.mypy-version }}
+          fi
+
       - name: Run mypy on plugin code
         run: uv run mypy --strict mypy_django_plugin
       - name: Run mypy on ext code