Add dependabot config #229

Job	Run time
Static Analysis	5m 52s
Lint (5.3, false)	2m 28s
Lint (5.4, false)	2m 28s
Lint (5.5, false)	2m 32s
Lint (5.6, false)	2m 27s
Lint (7.0, false)	2m 33s
Lint (7.1, false)	2m 27s
Lint (7.2, false)	2m 30s
Lint (7.3, false)	2m 28s
Lint (7.4, false)	2m 26s
Lint (8.0, false)	2m 26s
Lint (8.1, false)	2m 25s
Lint (8.2, false)	2m 21s
Lint (8.3, false)	2m 25s
Lint (8.4, true, --ignore-platform-reqs)	2m 22s
	40m 10s

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