This PR contains the following updates:

| Package | Type | Package file | Manager | Update | Change |
|---|---|---|---|---|---|
|
[com.google.cloud:google-cloud-spanner](https://github.com/googleapis/java-spanner)
| dependencies | misk/gradle/libs.versions.toml | gradle | minor |
`6.89.0` -> `6.90.0` |

---

### Release Notes

<details>
<summary>googleapis/java-spanner
(com.google.cloud:google-cloud-spanner)</summary>

###
[`v6.90.0`](https://github.com/googleapis/java-spanner/blob/HEAD/CHANGELOG.md#6900-2025-03-31)

##### Features

- Add default_isolation_level connection property
([#&#8203;3702](googleapis/java-spanner#3702))
([9472d23](googleapis/java-spanner@9472d23))
- Adds support for Interval datatype in Java client
([#&#8203;3416](googleapis/java-spanner#3416))
([8be8f5e](googleapis/java-spanner@8be8f5e))
- Integration test for End to End tracing
([#&#8203;3691](googleapis/java-spanner#3691))
([bf1a07a](googleapis/java-spanner@bf1a07a))
- Specify isolation level per transaction
([#&#8203;3704](googleapis/java-spanner#3704))
([868f30f](googleapis/java-spanner@868f30f))
- Support PostgreSQL isolation level statements
([#&#8203;3706](googleapis/java-spanner#3706))
([dda2e1d](googleapis/java-spanner@dda2e1d))

</details>

---

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---

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---

This PR has been generated by [Renovate
Bot](https://github.com/renovatebot/renovate).

GitOrigin-RevId: a63885015974acb6061bae5ca3b9d61136991376

Author: github-cash-renovate-jvm-2

gradle/libs.versions.toml

@@ -71,7 +71,7 @@ gcpDatastore = { module = "com.google.cloud:google-cloud-datastore", version = "
 gcpKms = { module = "com.google.apis:google-api-services-cloudkms", version = "v1-rev20250227-2.0.0" }
 gcpLogback = { module = "com.google.cloud:google-cloud-logging-logback", version = "0.130.11-alpha" }
 gcpLogging = { module = "com.google.cloud:google-cloud-logging", version = "3.22.0" }
-gcpSpanner = { module = "com.google.cloud:google-cloud-spanner", version = "6.89.0" }
+gcpSpanner = { module = "com.google.cloud:google-cloud-spanner", version = "6.90.0" }
 googleApiClient = { module = "com.google.api-client:google-api-client", version = "2.7.2" }
 googleApiServicesStorage = { module = "com.google.apis:google-api-services-storage", version = "v1-rev20250312-2.0.0" }
 googleAuthLibraryCredentials = { module = "com.google.auth:google-auth-library-credentials", version.ref = "googleAuth" }