Bump mypy to 1.5.x

[ippeiukai]

Please update compatible-mypy to allow 1.5.x.

related to:

• Next release planning (4.2.4) django-stubs#1651
• Update mypy requirement from ==1.4.* to ==1.5.* #456

similar to:

• Update compatible-mypy to 1.4.x #437

[mertcangokgoz]

yeah, it will be very nice if it is updated for 1.5.x.

[intgr]

Fixed in version 3.14.3. Apologies for neglecting this project for so long.