build: Unpin mypy and upgrade it to latest

This is possible now that django-stubs and djangorestframework-stubs
are unpinned:
openedx@a5b773c

which became possible once we upgraded to django 4.2.

Closes: openedx#35667

Author: kdmccormick

requirements/constraints.txt

@@ -112,12 +112,6 @@ markdown<3.4.0
 # Issue for unpinning: https://github.com/openedx/edx-platform/issues/35270
 moto<5.0
 
-# Date: 2024-10-16
-# MyPY 1.12.0 fails on all PRs with the following error:
-# openedx/core/djangoapps/content_libraries/api.py:732: error: INTERNAL ERROR
-# Issue for unpinning: https://github.com/openedx/edx-platform/issues/35667
-mypy<1.12.0
-
 # Date: 2024-07-16
 # We need to upgrade the version of elasticsearch to atleast 7.15 before we can upgrade to Numpy 2.0.0
 # Otherwise we see a failure while running the following command:

requirements/edx/development.txt

@@ -1292,7 +1292,7 @@ multidict==6.1.0
     #   -r requirements/edx/testing.txt
     #   aiohttp
     #   yarl
-mypy==1.11.2
+mypy==1.14.1
     # via
     #   -c requirements/edx/../constraints.txt
     #   -r requirements/edx/development.in