MNT: Create dependabot.yml for workflow auto updates #118

Job	Run time
Python 3.9 with required dependencies (windows-latest, py39-test-numpy122)	3m 5s
Python 3.10 with required dependencies (ubuntu-latest, py310-test-numpy124)	1m 15s
Python 3.11 with required dependencies (macos-latest, py311-test-astropy53)	49s
Python 3.12 with required dependencies (ubuntu-latest, py312-test)	2m 12s
Code style checks (ubuntu-latest, codestyle)	10s
publish / Load build targets	3s
publish / Build cp*-manylinux_x86_64 wheels	6m 37s
publish / Build source distribution	1m 32s
publish / Build cp*-manylinux_aarch64 wheels	1h 0m 3s
publish / Build cp*-macosx_x86_64 wheels	8m 32s
publish / Build cp*-macosx_arm64 wheels	5m 5s
publish / Build cp*-win_amd64 wheels	12m 27s
publish / Upload	0s
	1h 41m 50s

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