Bump com.sap.cloud.db.jdbc:ngdbc from 2.23.7 to 2.23.8 #4311

Job	Run time
integration-tests-h2	15m 59s
code-style (ubuntu)	1m 2s
integration-tests-postgresql	15m 53s
tests (ubuntu)	23m 3s
tests (windows)	32m 10s
	1h 28m 7s

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