Use 3.13 in regular CI (#13397)

Author: sobolevn

.github/workflows/tests.yml

@@ -62,7 +62,7 @@ jobs:
     strategy:
       matrix:
         platform: ["linux", "win32", "darwin"]
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
@@ -73,26 +73,6 @@ jobs:
       - run: uv pip install -r requirements-tests.txt --system
       - run: python ./tests/mypy_test.py --platform=${{ matrix.platform }} --python-version=${{ matrix.python-version }}
 
-  # Run this as a separate job, as the other versions in the matrix are
-  # (and should be) run *using* the Python version we're testing the stubs for,
-  # but we can't install all our non-types dependencies on py313 yet
-  mypy-313:
-    name: Run mypy against the 3.13 stubs
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        platform: ["linux", "win32", "darwin"]
-      fail-fast: false
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: 3.12
-          allow-prereleases: true
-      - run: curl -LsSf https://astral.sh/uv/install.sh | sh
-      - run: uv pip install -r requirements-tests.txt --system
-      - run: python ./tests/mypy_test.py --platform=${{ matrix.platform }} --python-version=3.13
-
   regression-tests:
     name: Run mypy on the test cases
     runs-on: ubuntu-latest