Test

CI: Introduce dependabot (#13) #9

Job	Run time
ruby-versions / Generate Ruby versions	3s
ubuntu-latest 3.1	11s
ubuntu-latest 3.0	11s
macos-latest 2.7	36s
macos-latest 3.1	13s
ubuntu-latest 2.7	27s
macos-latest 3.0	15s
ubuntu-latest 3.4	14s
ubuntu-latest 3.3	14s
ubuntu-latest 4.0	16s
ubuntu-latest head	12s
ubuntu-latest 3.2	13s
macos-latest head	15s
macos-latest 3.2	13s
macos-latest 3.3	14s
macos-latest 3.4	12s
macos-latest 4.0	13s
	4m 12s

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