Bump ca.uhn.hapi.fhir:hapi-fhir-structures-dstu3 from 7.4.5 to 7.6.0 in /service #633

Job	Run time
Checkstyle	47s
Spotbugs	49s
Unit Tests	1m 56s
End-to-End Testing	3m 38s
Integration Tests	8m 49s
Build & Publish Docker Images (service, gp2gp, .)	1m 29s
Build & Publish Docker Images (wiremock, gp2gp-wiremock, .)	43s
Build & Publish Docker Images (mock-mhs-adaptor, gp2gp-mock-mhs, .)	1m 11s
Build & Publish Docker Images (gpcc-mock, gp2gp-gpcc-mock, ./docker/gpcc-mock)	18s
Build & Publish Docker Images (gpc-api-mock, gp2gp-gpc-api-mock, ./docker/gpc-api-mock)	25s
Build & Publish Docker Images (sds-api-mock, gp2gp-sds-api-mock, ./docker/sds-api-mock)	17s
	20m 22s

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