ci: make dependabot group updates in single PR #257

Job	Run time
build_asan	3m 12s
build (ubuntu-latest, 3.12.0, false)	34s
build (ubuntu-latest, 3.12.0, true)	30s
build (ubuntu-latest, 3.11.6, false)	31s
build (ubuntu-latest, 3.11.6, true)	21s
build (ubuntu-latest, 3.10.11, false)	23s
build (ubuntu-latest, 3.10.11, true)	30s
build (ubuntu-latest, 3.8.17, false)	24s
build (ubuntu-latest, 3.8.17, true)	26s
build (ubuntu-20.04, 3.6.8, false)	23s
build (ubuntu-20.04, 3.6.8, true)	18s
build (ubuntu-latest, pypy-3.7, false)	33s
build (ubuntu-latest, pypy-3.7, true)	35s
build (macos-latest, 3.12.0, false)	1m 29s
build (macos-latest, 3.11.6, false)	1m 39s
build (macos-latest, 3.10.11, false)	52s
build (macos-latest, 3.8.17, false)	48s
build (macos-latest, 3.6.8, false)	38s
build (macos-latest, pypy-3.7, false)	38s
build (windows-latest, 3.12.0, false)	1m 43s
build (windows-latest, 3.11.6, false)	2m 51s
build (windows-latest, 3.10.11, false)	1m 40s
build (windows-latest, 3.8.10, false)	1m 16s
build (windows-latest, 3.6.8, false)	1m 48s
build (windows-latest, pypy-3.7, false)	1m 22s
	25m 24s

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