test

Bump mypy from 1.19.1 to 1.20.2 #2554

Job	Run time
ubuntu-latest - 3.11	8m 27s
ubuntu-24.04-arm - 3.10	6m 41s
ubuntu-latest - 3.10	7m 29s
ubuntu-latest - 3.12	8m 41s
ubuntu-latest - 3.14	8m 53s
ubuntu-24.04-arm - 3.11	8m 7s
ubuntu-24.04-arm - 3.14	7m 49s
ubuntu-24.04-arm - 3.12	7m 54s
ubuntu-latest - 3.14 free-threading	8m 52s
ubuntu-latest - 3.15-dev	9m 11s
ubuntu-24.04-arm - 3.13	7m 57s
ubuntu-latest - 3.15-dev free-threading	6h 5m 0s
macos-latest - 3.14	5m 58s
windows-latest - 3.14	14m 16s
ubuntu-latest - 3.13	8m 26s
ubuntu-24.04-arm - 3.14 free-threading	7m 56s
ubuntu-latest - pypy-3.11	13m 31s
	8h 25m 8s

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