ci: add GITHUB_TOKEN to bypass rate limit #1494

Job	Run time
autotests (ubuntu-latest, 3.8, std, .)	26m 9s
autotests (ubuntu-latest, 3.9, std, .)	41m 59s
autotests (ubuntu-latest, 3.10, std, .)	24m 58s
autotests (ubuntu-latest, 3.11, std, .)	32m 57s
autotests (windows-latest, 3.8, std, .)	43m 10s
autotests (windows-latest, 3.9, std, .)	43m 20s
autotests (windows-latest, 3.10, std, .)	1h 2m 15s
autotests (windows-latest, 3.11, std, .)	52m 24s
autotests (macos-latest, 3.9)	40m 7s
coveralls_finish	6s
	6h 7m 25s

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