Change dependabot's target branch to `develop` #942

Job	Run time
build (ubuntu-latest, 3.9, latest)	10m 46s
build (ubuntu-latest, 3.9, 8.1)	7m 20s
fossa-scan / Run fossa scan on repository	29s
build (ubuntu-latest, 3.13, 8.2)	8m 11s
build (ubuntu-latest, 3.13, latest)	10m 44s
build (ubuntu-latest, 3.9, 8.2)	7m 32s
build (ubuntu-22.04, 3.7, latest)	10m 40s
build (ubuntu-latest, 3.13, 8.1)	7m 10s
build (ubuntu-22.04, 3.7, 8.2)	7m 13s
build (ubuntu-22.04, 3.7, 8.1)	7m 16s
fossa-scan / Fetch fossa results	1m 0s
	1h 18m 21s

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