Bump org.testcontainers:testcontainers from 1.20.3 to 1.20.4 in /service #635

Job	Run time
Checkstyle	49s
Spotbugs	1m 8s
Unit Tests	1m 49s
Integration Tests	9m 17s
End-to-End Testing	3m 55s
Build & Publish Docker Images (service, gp2gp, .)	1m 30s
Build & Publish Docker Images (wiremock, gp2gp-wiremock, .)	46s
Build & Publish Docker Images (mock-mhs-adaptor, gp2gp-mock-mhs, .)	1m 10s
Build & Publish Docker Images (gpcc-mock, gp2gp-gpcc-mock, ./docker/gpcc-mock)	20s
Build & Publish Docker Images (gpc-api-mock, gp2gp-gpc-api-mock, ./docker/gpc-api-mock)	18s
Build & Publish Docker Images (sds-api-mock, gp2gp-sds-api-mock, ./docker/sds-api-mock)	18s
	21m 20s

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