ci: fix missing permissions in labeler workflow #6010

Job	Run time
Linter	43s
Format check	48s
Unit tests (ubuntu-latest)	43s
Integration tests (ubuntu-latest)	49s
Unit tests (windows-latest)	1m 36s
Build	43s
Integration tests (windows-latest)	1m 39s
E2E tests (windows-latest)	1m 37s
Integration tests (macos-latest)	1m 1s
Unit tests (macos-latest)	1m 2s
E2E tests (macos-latest)	47s
E2E tests (ubuntu-latest)	46s
	12m 14s

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