Bump gradle-wrapper from 8.5 to 9.6.1 in /mock-mhs-adaptor #2469

Job	Run time
Spotbugs	1m 18s
Checkstyle	1m 14s
Unit Tests	47s
Integration Tests	9m 30s
End-to-End Testing	3m 40s
Build & Publish Docker Images (mock-mhs-adaptor, gp2gp-mock-mhs, .)	1m 34s
Build & Publish Docker Images (wiremock, gp2gp-wiremock, .)	58s
Build & Publish Docker Images (gpcc-mock, gp2gp-gpcc-mock, ./docker/gpcc-mock)	27s
Build & Publish Docker Images (gpc-api-mock, gp2gp-gpc-api-mock, ./docker/gpc-api-mock)	20s
Build & Publish Docker Images (sds-api-mock, gp2gp-sds-api-mock, ./docker/sds-api-mock)	23s
Build & Publish Docker Images (service, gp2gp, .)	1m 42s
	21m 53s

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