Enable Dependabot for Github actions #4862

Job	Run time
Enzyme CI LLVM 11 Release ubuntu-20.04	4m 11s
Enzyme CI LLVM 11 Debug ubuntu-20.04	3m 50s
Enzyme CI LLVM 12 Release ubuntu-20.04	4m 20s
Enzyme CI LLVM 12 Debug ubuntu-20.04	4m 2s
Enzyme CI LLVM 13 Release ubuntu-20.04	4m 13s
Enzyme CI LLVM 13 Debug ubuntu-20.04	3m 56s
Enzyme CI LLVM 11 Release macOS	28s
Enzyme CI LLVM 14 Release ubuntu-20.04	4m 18s
Enzyme CI LLVM 11 Debug macOS	28s
Enzyme CI LLVM 14 Debug ubuntu-20.04	4m 0s
Enzyme CI LLVM 15 Release ubuntu-20.04	4m 21s
Enzyme CI LLVM 12 Release macOS	7m 26s
Enzyme CI LLVM 13 Release macOS XCode	4m 43s
Enzyme CI LLVM 15 Debug ubuntu-20.04	4m 1s
Enzyme CI LLVM 12 Debug macOS	11m 10s
Enzyme CI LLVM 16 Release ubuntu-20.04	4m 33s
Enzyme CI LLVM 13 Release macOS	10m 46s
Enzyme CI LLVM 16 Debug ubuntu-20.04	3m 51s
Enzyme CI LLVM 13 Debug macOS	9m 38s
Enzyme CI LLVM 14 Release macOS	10m 19s
Enzyme CI LLVM 14 Debug macOS	9m 8s
Enzyme CI LLVM 15 Release macOS	5m 32s
Enzyme CI LLVM 15 Debug macOS	8m 35s
	2h 7m 49s

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