chore: add explicit permissions to release-please workflow #1726

Job	Run time
contract-tests	4m 29s
contract-tests-curl	4m 25s
build-test-server-curl	7m 30s
build-test-server-mac	5m 58s
build-test-server-mac-curl	5m 28s
build-test-server-windows	17m 34s
build-test-server	7m 58s
build-test-server-windows-curl	18m 21s
	1h 11m 43s

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