Bump com.github.spotbugs from 6.1.13 to 6.4.0 in /service #1601

Job	Run time
Checkstyle	50s
Spotbugs	1m 13s
End-to-End Testing	3m 51s
Unit Tests	59s
Integration Tests	9m 7s
Build & Publish Docker Images (wiremock, gp2gp-wiremock, .)	42s
Build & Publish Docker Images (sds-api-mock, gp2gp-sds-api-mock, ./docker/sds-api-mock)	30s
Build & Publish Docker Images (gpc-api-mock, gp2gp-gpc-api-mock, ./docker/gpc-api-mock)	23s
Build & Publish Docker Images (mock-mhs-adaptor, gp2gp-mock-mhs, .)	1m 2s
Build & Publish Docker Images (service, gp2gp, .)	1m 27s
Build & Publish Docker Images (gpcc-mock, gp2gp-gpcc-mock, ./docker/gpcc-mock)	23s
	20m 27s

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