ci: add permissions to yml validation workflow #697

Job	Run time
Documentation	39s
Tests that may fail due to network or HTML	26m 41s
Long tests on Python 3.10	35m 7s
Long tests on Python 3.10 (language parsers)	30m 11s
Long tests on Python 3.10 (scanners)	38m 41s
Long tests on Python 3.10 (synchronous)	48m 57s
Linux tests (3.9)	49m 53s
Windows long tests	7m 29s
Linux tests (3.11)	24m 59s
Linux tests (3.12)	27m 0s
	4h 49m 37s

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