build(deps): bump cloud.google.com/go/datastore from 1.4.0 to 1.5.0

[dependabot-preview]

Bumps cloud.google.com/go/datastore from 1.4.0 to 1.5.0.

Release notes

Sourced from cloud.google.com/go/datastore's releases.

spanner/v1.5.0

• Metrics
  • Instrument client library with adding OpenCensus metrics. This allows for better monitoring of the session pool.
• Session management
  • Switch the session keepalive method from GetSession to SELECT 1.
• Emulator
  • Use client hooks for admin clients running against an emulator. With this change, users can use SPANNER_EMULATOR_HOST for initializing admin clients when running against an emulator.
• spansql
  • Add space between constraint name and foreign key def.
• Misc
  • Fix segfault when a non-existent credentials file had been specified.
  • Fix cleaning up instances in integration tests.
  • Fix race condition in batch read-only transaction.
  • Fix the flaky TestLIFOTakeWriteSessionOrder test.
  • Fix ITs to order results in SELECT queries.
  • Fix the documentation of timestamp bounds.
  • Fix the regex issue in managing backups.

pubsub/v1.5.0

v1.5.0

• Add support for subscription detachment.
• Add support for message filtering in subscriptions.
• Add support for RetryPolicy (server-side feature).
• Fix publish error path when ordering key is disabled.
• Fix panic on Topic.ResumePublish method.

bigtable/v1.5.0

• Add support for managed backups.

firestore firestore/v1.5.0

Features

• firestore: add opencensus tracing support (#2942) (257f322)

Bug Fixes

• firestore: address a missing branch in watch.stop() error remapping (#3643) (89ad55d)

datastore datastore/v1.5.0

Features

... (truncated)

Commits

• 34780b6 Merge branch 'master' of github.com:googleapis/google-cloud-go into master
• 31f3739 chore(pubsub): release v1.5.0 (#2555)
• ae52048 feat(all): auto-regenerate gapics (#2557)
• cf8098d Merge branch 'master' of github.com:hongalex/google-cloud-go
• c1efc75 fix formatting
• 63c5782 Merge branch 'master' into master
• f2f3257 feat(all): auto-regenerate gapics (#2552)
• 6ba4923 chore(pubsub): release v1.5.0
• d611d97 feat(all): auto-regenerate gapics (#2547)
• 124b570 spanner: add a statement-based way to run read-write transaction. (#2545)
• Additional commits viewable in compare view

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