Use grouped update of dependabot #3152

Job	Run time
test (no rustup)	1m 54s
test (1.26)	7m 1s
test (stable)	3m 8s
test (1.30)	4m 30s
test (beta)	3m 22s
test (1.31)	4m 58s
test (nightly)	3m 3s
test (1.36)	5m 57s
test (nightly, macos-latest)	2m 47s
test (1.39)	5m 45s
test (nightly, windows-latest)	4m 35s
test (1.41)	5m 45s
deny / deny	16s
miri / miri	56s
msrv / msrv	3m 36s
release-dry-run / prepare	7s
tidy / tidy	1m 58s
release-dry-run / build (aarch64-unknown-linux-gnu)	1m 7s
release-dry-run / build (aarch64-unknown-linux-musl)	57s
release-dry-run / build (aarch64-apple-darwin, macos-12)	2m 0s
release-dry-run / build (aarch64-pc-windows-msvc, windows-2019)	2m 5s
release-dry-run / build (x86_64-unknown-linux-gnu)	44s
release-dry-run / build (x86_64-unknown-linux-musl)	54s
release-dry-run / build (x86_64-apple-darwin, macos-12)	1m 1s
release-dry-run / build (x86_64-pc-windows-msvc, windows-2019)	3m 0s
release-dry-run / build (x86_64-unknown-freebsd)	1m 11s
release-dry-run / build (x86_64-unknown-illumos)	57s
release-dry-run / build (universal-apple-darwin, macos-12)	1m 33s
	1h 15m 7s

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