rm merge-dependabot-pr.yml from Unsupported Branch #8185

Job	Run time
Check Samples	1m 28s
Check for Package Tangles	1m 39s
Build (ubuntu-latest, 17) / Build	1m 33s
Build (windows-latest, 17) / Build	1m 37s
Test Against Snapshots (17, 17) / Test	1m 28s
Test Against Snapshots (21-ea, 21) / Test	1m 44s
Deploy Schema	0s
Deploy Artifacts	0s
Deploy Docs	0s
Perform Release	0s
Send Notification	4s
	9m 33s

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