Add dependabot.yml for dependency version updates #4474

Job	Run time
check-git-rev-deps	18s
cargo-deny (advisories)	38s
cargo-deny (bans licenses sources)	39s
build-fuzz	2m 57s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	7m 35s
docs	4m 30s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	5m 6s
fmt	25s
readme	2m 50s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	19m 36s
semver-checks	6m 5s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	8m 14s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	5m 2s
publish-dry-run	0s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	19m 11s
complete	1s
	1h 23m 7s

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