build(deps): bump mypy from 1.8.0 to 1.15.0 in /.github/workflows/requirements/style #85

Job	Run time
changes	3s
prechecks / validate	38s
prechecks / style	58s
prechecks / bootstrap-dev-rhel8	4m 14s
prechecks / import-check	3m 8s
prechecks / audit / package-audits (windows-latest, powershell Invoke-Expression -Command "./share/spack/qa/windows_t...	5m 5s
prechecks / audit / package-audits (ubuntu-latest, bash)	8m 12s
prechecks / audit / package-audits (macos-latest, bash)	6m 23s
all-prechecks	1s
bootstrap	0s
unit-tests	0s
coverage	0s
all	1s
	28m 43s

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