build: update dependency @google-cloud/spanner to v8

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
@google-cloud/spanner	devDependencies	major	7.21.0 -> 8.0.0
@google-cloud/spanner	dependencies	major	7.21.0 -> 8.0.0

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Release Notes

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

v8.0.0

Compare Source

⚠ BREAKING CHANGES

• remove the arrify package (#​2292)
• migrate to Node 18 (#​2271)

Features

• Add promise based signatures for createQueryPartitions (#​2284) (255d8a6)
• Add promise based signatures on createReadPartitions (#​2300) (7b8a1f7)
• Support promise based signatures for execute method (#​2301) (bb857e1)

Bug Fixes

• deps: Update dependency @​google-cloud/kms to v5 (#​2289) (1ccb505)
• deps: Update dependency @​google-cloud/precise-date to v5 (#​2290) (44f7575)
• deps: Update dependency big.js to v7 (#​2286) (0911297)

Miscellaneous Chores

• Migrate to Node 18 (#​2271) (cab3f22)
• Remove the arrify package (#​2292) (e8f5ca1)

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This PR has been generated by Renovate Bot.

[josephperrott]

LGTM

[josephperrott]

This PR was merged into the repository by commit d8615e0.

The changes were merged into the following branches: main

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