build(deps): bump testcontainers from 1.20.5 to 1.20.6 #13613

Job	Run time
API-Tests	7m 47s
Checkstyle	4m 52s
Component-Tests	11m 57s
End-To-End-Tests	17m 4s
Javadoc	6m 26s
Postgresql-Integration-Tests	11m 1s
Unit-Tests	10m 11s
CodeQL / Analyze (java)	12m 27s
Verify-OpenApi / prepare-api-groups	3m 47s
Verify-OpenApi / verify-spec (control-api)	1m 51s
Verify-OpenApi / verify-spec (management-api)	1m 57s
Verify-OpenApi / verify-spec (observability-api)	1m 57s
Verify-OpenApi / verify-spec (public-api)	1m 50s
Verify-OpenApi / verify-spec (version-api)	2m 10s
	1h 35m 17s

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