Bump mypy from 1.14.1 to 1.15.0 #425

Job	Run time
Code quality	31s
Tests on ubuntu-latest and 3.9	12s
Tests on ubuntu-latest and 3.10	14s
Tests on ubuntu-latest and 3.11	13s
Tests on ubuntu-latest and 3.12	24s
Tests on ubuntu-latest and 3.13	13s
Tests on ubuntu-latest and pypy3.9	21s
Tests on ubuntu-latest and pypy3.10	26s
Tests on windows-latest and 3.9	41s
Tests on windows-latest and 3.10	59s
Tests on windows-latest and 3.11	1m 3s
Tests on windows-latest and 3.12	49s
Tests on windows-latest and 3.13	53s
Tests on windows-latest and pypy3.9	2m 13s
Tests on windows-latest and pypy3.10	2m 13s
Tests on macos-latest and 3.9	29s
Tests on macos-latest and 3.10	34s
Tests on macos-latest and 3.11	14s
Tests on macos-latest and 3.12	15s
Tests on macos-latest and 3.13	16s
Tests on macos-latest and pypy3.9	45s
Tests on macos-latest and pypy3.10	51s
Code coverage	22s
	15m 11s

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