fix(deps): update dependency @google-cloud/bigtable to v5

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/bigtable	^4.0.0 -> ^5.0.0

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Release Notes

googleapis/nodejs-bigtable (@​google-cloud/bigtable)

v5.0.0

Compare Source

⚠ BREAKING CHANGES

• upgrade to Node 14 (#​1311)

Miscellaneous Chores

• Upgrade to Node 14 (#​1311) (4330cb2)

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