ci: migrate GH_TOKEN_ADMIN to GitHub App token (#457) #1155

Job	Run time
pre-commit	19s
meta	10s
fossa-scan	52s
compliance-copyrights	28s
test-unit 3.13	2m 0s
test-unit 3.11	1m 53s
test-unit 3.12	1m 58s
test-unit 3.10	2m 0s
semgrep / sast-scan	38s
test-unit 3.9	2m 3s
test-splunk (9.4.0, 6b4ebe426ca6, true, false)	3m 10s
test-splunk (9.3.2, d8bb32809498, false, false)	3m 8s
publish	1m 11s
	19m 50s

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