…18.0 (#1113)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigquery](https://togithub.com/googleapis/java-bigquery) | `2.17.1` -> `2.18.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquery/2.18.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquery/2.18.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquery/2.18.2/compatibility-slim/2.17.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigquery/2.18.2/confidence-slim/2.17.1)](https://docs.renovatebot.com/merge-confidence/) |

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…ative to v0.9.23 (#1113)

* fix: Make supporting classes of AwsCredentials serializable

* Add unit test for ExternalAccountCredentials test.
Discovered ServiceAccountImpersonationOptions needed be serializable as well.

* Fix linting

* Add serialization tests for subclasses of ExternalAccountCredentials

Note that PluggableAuthCredentials uses a non-serializable ExecutableHandler.
It's not clear that this can/should be a serializable credential source.

* Add serialVersionUID fields to classes implementing ExternalAccountCredentials

* fix: Make supporting classes of AwsCredentials serializable

* Add unit test for ExternalAccountCredentials test.
Discovered ServiceAccountImpersonationOptions needed be serializable as well.

* Fix linting

* Add serialization tests for subclasses of ExternalAccountCredentials

Note that PluggableAuthCredentials uses a non-serializable ExecutableHandler.
It's not clear that this can/should be a serializable credential source.

* Add serialVersionUID fields to classes implementing ExternalAccountCredentials

…jdbc to v2.9.3 (googleapis#1113)

…8.0 (#1113)

…8.0 (#1113)