Set dependabot to monthly #451

Job	Run time
Test download cache 1/2 (windows-latest)	3m 0s
Test env cache 1/2 (windows-latest)	2m 59s
Test download cache 1/2 (ubuntu-latest)	2m 33s
Test env cache 1/2 (ubuntu-latest)	2m 33s
Test env cache with changing root path 1/2 (windows-latest)	3m 8s
Test download cache 1/2 (macos-latest)	4m 36s
Test env cache 1/2 (macos-latest)	3m 1s
Test env cache with changing root path 1/2 (ubuntu-latest)	2m 31s
Test env cache with changing root path 1/2 (macos-latest)	3m 16s
Test env then download 1/2 (windows-latest)	3m 6s
Test env then download 1/2 (ubuntu-latest)	2m 31s
Test env then download 1/2 (macos-latest)	3m 0s
Test env cache 2/2 (windows-latest)	23s
Test env cache 2/2 (ubuntu-latest)	4s
Test env cache 2/2 (macos-latest)	16s
Test env then download 2/2 (windows-latest)	26s
Test env then download 2/2 (ubuntu-latest)	5s
Test env then download 2/2 (macos-latest)	17s
Test env cache with changing root path 2/2 (windows-latest)	3m 14s
Test env cache with changing root path 2/2 (ubuntu-latest)	2m 35s
Test env cache with changing root path 2/2 (macos-latest)	3m 2s
Test download cache 2/2 (windows-latest)	51s
Test download cache 2/2 (ubuntu-latest)	16s
Test download cache 2/2 (macos-latest)	36s
	48m 19s

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