Bump mypy from 1.14.1 to 1.15.0 #427

Job	Run time
Code quality	35s
Tests on ubuntu-latest and 3.9	13s
Tests on ubuntu-latest and 3.10	18s
Tests on ubuntu-latest and 3.11	13s
Tests on ubuntu-latest and 3.12	17s
Tests on ubuntu-latest and 3.13	13s
Tests on ubuntu-latest and pypy3.9	32s
Tests on ubuntu-latest and pypy3.10	29s
Tests on windows-latest and 3.9	52s
Tests on windows-latest and 3.10	42s
Tests on windows-latest and 3.11	49s
Tests on windows-latest and 3.12	53s
Tests on windows-latest and 3.13	57s
Tests on windows-latest and pypy3.9	1m 32s
Tests on windows-latest and pypy3.10	2m 0s
Tests on macos-latest and 3.9	32s
Tests on macos-latest and 3.10	40s
Tests on macos-latest and 3.11	15s
Tests on macos-latest and 3.12	22s
Tests on macos-latest and 3.13	15s
Tests on macos-latest and pypy3.9	40s
Tests on macos-latest and pypy3.10	30s
Code coverage	15s
	14m 4s

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