[3.14] Update mypy to 2.4.0 (GH-160813) (#160817)

Update mypy to `2.4.0` (GH-160813)
(cherry picked from commit 3a304c2)

Co-authored-by: sobolevn <mail@sobolevn.me>

Author: miss-islington

Tools/requirements-dev.txt

@@ -1,7 +1,7 @@
 # Requirements file for external linters and checks we run on
 # Tools/clinic, Tools/cases_generator/, and Tools/peg_generator/ in CI
-mypy==2.3.1
+mypy==2.4.0
 
 # needed for peg_generator:
 types-psutil==7.2.2.20260906
-types-setuptools==84.0.0.20260812
+types-setuptools==84.0.0.20261006