fix: made the version check on updates atomic

(cherry picked from commit 95266f7a08066d1afeda17611bc3dfa011f30d20)
upgrade crate-admin to 0.5.3
prepare release 0.35.8
Merge branch '0.35'

Conflicts:
	CHANGES.txt
	app/build.gradle
	core/src/main/java/io/crate/Version.java
	sql/src/test/java/io/crate/executor/transport/TransportExecutorTest.java
	sql/src/test/java/io/crate/integrationtests/TransportSQLActionTest.java