[3.13] CI: Bump Python to 3.13 and mypy to 1.12 in mypy workflow (GH-… (python#125596)

[3.13] CI: Bump Python to 3.13 and mypy to 1.12 in mypy workflow (pythonGH-125592)

(cherry picked from commit d83fcf8)

Author: Eclips4

.github/workflows/mypy.yml

@@ -53,7 +53,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.11"
+          python-version: "3.13"
           cache: pip
           cache-dependency-path: Tools/requirements-dev.txt
       - run: pip install -r Tools/requirements-dev.txt

Tools/requirements-dev.txt

@@ -1,6 +1,6 @@
 # Requirements file for external linters and checks we run on
 # Tools/clinic, Tools/cases_generator/, and Tools/peg_generator/ in CI
-mypy==1.10.0
+mypy==1.12
 
 # needed for peg_generator:
 types-psutil==5.9.5.20240423