ci: add dependabot #244

Job	Run time
build_asan	2m 54s
build (ubuntu-latest, 3.12.0, false)	33s
build (ubuntu-latest, 3.12.0, true)	31s
build (ubuntu-latest, 3.11.6, false)	31s
build (ubuntu-latest, 3.11.6, true)	23s
build (ubuntu-latest, 3.10.11, false)	36s
build (ubuntu-latest, 3.10.11, true)	21s
build (ubuntu-latest, 3.8.17, false)	22s
build (ubuntu-latest, 3.8.17, true)	19s
build (ubuntu-20.04, 3.6.8, false)	17s
build (ubuntu-20.04, 3.6.8, true)	17s
build (ubuntu-latest, pypy-3.7, false)	30s
build (ubuntu-latest, pypy-3.7, true)	33s
build (macos-latest, 3.12.0, false)	1m 22s
build (macos-latest, 3.11.6, false)	57s
build (macos-latest, 3.10.11, false)	54s
build (macos-latest, 3.8.17, false)	39s
build (macos-latest, 3.6.8, false)	1m 12s
build (macos-latest, pypy-3.7, false)	41s
build (windows-latest, 3.12.0, false)	2m 27s
build (windows-latest, 3.11.6, false)	3m 9s
build (windows-latest, 3.10.11, false)	1m 49s
build (windows-latest, 3.8.10, false)	2m 0s
build (windows-latest, 3.6.8, false)	1m 49s
build (windows-latest, pypy-3.7, false)	2m 15s
	27m 21s

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