fix: remove google-cloud-bigtable-deps-bom from gapic-libraries-bom #2323

Job	Run time
filter	1m 7s
downstream-compatibility (java-bigtable)	9m 0s
downstream-compatibility (java-firestore)	4m 8s
downstream-compatibility (java-pubsublite)	4m 20s
downstream-compatibility (java-pubsub)	4m 20s
downstream-compatibility (spring-cloud-gcp)	12m 21s
conditional-required-check	3s
	35m 19s

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