chore: bump cloud.google.com/go/auth from 0.19.0 to 0.20.0

[dependabot]

Bumps cloud.google.com/go/auth from 0.19.0 to 0.20.0.

Changelog

Sourced from cloud.google.com/go/auth's changelog.

v0.20.0

• bigquery: Support SchemaUpdateOptions for load jobs.

• bigtable:

  • Add SampleRowKeys.
  • cbt: Support union, intersection GCPolicy.
  • Retry admin RPCS.
  • Add trace spans to retries.

• datastore: Add OpenCensus tracing.

• firestore:

  • Fix queries involving Null and NaN.
  • Allow Timestamp protobuffers for time values.

• logging: Add a WriteTimeout option.

• spanner: Support Batch API.

• storage: Add OpenCensus tracing.

Commits

• 4b98a63 README.md: add news for next release
• aae690d storage: mark bucket lock as private alpha
• 5882e88 firestore: add the read time to DocumentSnapshot, part 1
• 7808a7b internal: clean up OC tests
• a1b76a8 pubsub: use the new aggreagation API
• 63a4704 Bigquery Loader: add SchemaUpdateOptions
• f0945c7 storage: fix OC test
• 11ffa33 datastore: add OC integration test
• 51968c3 storage: add RangeReader test
• f2174aa storage: put read code together
• Additional commits viewable in compare view

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[tiffanny29631]

/ok-to-test

[cowsking]

/test kpt-config-sync-presubmit