deps: update dependency com.google.cloud:google-cloud-bigtable-bom to v2.20.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-bigtable-bom	2.19.2 -> 2.20.0

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Release Notes

googleapis/java-bigtable

v2.20.0

Compare Source

Features

• Add getNewPartitions method to CloseStream for Bigtable ChangeStream (#​1655) (8847fed)
• Add new_partitions field for CloseStream for Cloud Bigtable ChangeStream (#​1654) (0e283bf)

Bug Fixes

• Fix StackOverflow in ChangeStreamStateMachine due to excessive mods (#​1648) (9e11106)
• Use org.threeten.bp.Duration for ReadChangeStreamQuery::heartbeatDura… (#​1652) (87261a9)

Dependencies

• Update dependency com.google.cloud:google-cloud-monitoring-bom to v3.13.0 (#​1656) (1c632ec)
• Update dependency com.google.cloud:google-cloud-shared-dependencies to v3.4.0 (#​1657) (c7a3e29)

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