fix(ci): point Dependabot at the pnpm workspace root #20

Job	Run time
Protocol suite	44s
Agent runtime suite	17s
macOS build and protocol suite	1m 47s
Web app	1m 0s
Linux E2E (Docker)	1m 42s
Static checks	24s
macOS E2E (WKWebView)	0s
	5m 54s

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