[CI] Remove some Python 3.14 workarounds (#14651)

.github/workflows/daily.yml

@@ -35,7 +35,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14-dev"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
 
     steps:

.github/workflows/stubtest_stdlib.yml

@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14-dev"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
 
     steps:

.github/workflows/tests.yml

@@ -42,14 +42,14 @@ jobs:
     strategy:
       matrix:
         platform: ["linux", "win32", "darwin"]
-        # TODO (2025-05-10) "3.13.2" should be "3.14-dev", see below.
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.13.2"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
       - uses: astral-sh/setup-uv@v6
         with:
           version-file: "requirements-tests.txt"
@@ -63,15 +63,9 @@ jobs:
           fi
       - name: Run mypy_test.py
         run: |
-          # TODO: (2025-05-10) This is a bad hack to work around mypy crashing
-          # when running on Python 3.14. See https://github.com/python/mypy/pull/19020.
-          if [[ "${{ matrix.python-version }}" == "3.13.2" ]]; then
-              MYPY_PY_VERSION="3.14"
-          else
-            # python-version can sometimes be pinned to a specific version or to "-dev", but
-            # mypy understands only X.Y version numbers.
-            MYPY_PY_VERSION=$(echo ${{ matrix.python-version }} | cut -d - -f 1 | cut -d . -f 1-2)
-          fi
+          # python-version can sometimes be pinned to a specific version or to "-dev", but
+          # mypy understands only X.Y version numbers.
+          MYPY_PY_VERSION=$(echo ${{ matrix.python-version }} | cut -d - -f 1 | cut -d . -f 1-2)
           python ./tests/mypy_test.py --platform=${{ matrix.platform }} --python-version=${MYPY_PY_VERSION}
 
   regression-tests:

requirements-tests.txt

@@ -4,9 +4,7 @@ mypy==1.17.1
 pyright==1.1.404
 
 # Libraries used by our various scripts.
-# TODO (2025-05-09): Installing this on Python 3.14 on Windows fails at
-# the moment.
-aiohttp==3.12.14; python_version < "3.14"
+aiohttp==3.12.15
 # TODO (2025-05-09): No wheels exist for Python 3.14 yet, slowing down CI
 # considerably and prone to fail.
 grpcio-tools>=1.66.2; python_version < "3.14" # For grpc_tools.protoc
@@ -16,8 +14,7 @@ pathspec>=0.11.1
 pre-commit
 # Required by create_baseline_stubs.py. Must match .pre-commit-config.yaml.
 ruff==0.12.2
-# TODO (2025-05-07): Dependency libcst doesn't support Python 3.14 yet.
-stubdefaulter==0.1.0; python_version < "3.14"
+stubdefaulter==0.1.0
 termcolor>=2.3
 tomli==2.2.1; python_version < "3.11"
 tomlkit==0.13.3