Bump testcontainersVersion from 1.20.1 to 1.20.2 #600

Job	Run time
Build on ubuntu-latest with jdk 11	1m 6s
Check on ubuntu-latest (JDK-11, OpenSearch 1.3.16)	3m 56s
Build on macos-latest with jdk 11	3m 19s
Check on ubuntu-latest (JDK-17, OpenSearch 1.3.16)	3m 43s
Build on windows-latest with jdk 11	5m 32s
Check on ubuntu-latest (JDK-11, OpenSearch 2.13.0)	3m 54s
Build on ubuntu-latest with jdk 17	1m 0s
Check on ubuntu-latest (JDK-17, OpenSearch 2.13.0)	4m 2s
Build on macos-latest with jdk 17	1m 3s
Check on ubuntu-latest (JDK-21, OpenSearch 2.13.0)	4m 0s
Build on windows-latest with jdk 17	3m 22s
Build on ubuntu-latest with jdk 21	3m 13s
Build on macos-latest with jdk 21	1m 2s
Build on windows-latest with jdk 21	1m 51s
	41m 3s

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