Use SHA for BLOB update instead of modification time #646

Job	Run time
build (ubuntu-latest, 11, Client, false)	7m 45s
build (ubuntu-latest, 11, Server, false)	19m 20s
build (ubuntu-latest, 11, Core, false)	11m 27s
build (ubuntu-latest, 11, External, false)	5m 48s
build (ubuntu-latest, 11, Check-Updated-License-Files, false)	5m 41s
build (ubuntu-latest, 11, Integration-Test, false)	7m 9s
build (ubuntu-latest, 17, Client, false)	7m 20s
build (ubuntu-latest, 17, Server, false)	18m 45s
build (ubuntu-latest, 17, Core, false)	11m 18s
build (ubuntu-latest, 17, External, false)	5m 34s
build (ubuntu-latest, 17, Check-Updated-License-Files, false)	5m 44s
build (ubuntu-latest, 17, Integration-Test, false)	6m 59s
build (ubuntu-latest, 21, Client, false)	7m 19s
build (ubuntu-latest, 21, Server, false)	18m 39s
build (ubuntu-latest, 21, Core, false)	11m 2s
build (ubuntu-latest, 21, External, false)	5m 52s
build (ubuntu-latest, 21, Check-Updated-License-Files, false)	5m 40s
build (ubuntu-latest, 21, Integration-Test, false)	6m 53s
	2h 48m 15s

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