Bump com.google.cloud:google-cloud-spanner from 6.85.0 to 6.86.0

Bumps [com.google.cloud:google-cloud-spanner](https://github.com/googleapis/java-spanner) from 6.85.0 to 6.86.0.
- [Release notes](https://github.com/googleapis/java-spanner/releases)
- [Changelog](https://github.com/googleapis/java-spanner/blob/main/CHANGELOG.md)
- [Commits](googleapis/java-spanner@v6.85.0...v6.86.0)

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-spanner
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

providers/spanner/shedlock-provider-spanner/pom.xml

@@ -12,7 +12,7 @@
     <version>6.2.1-SNAPSHOT</version>
 
     <properties>
-        <google-cloud-spanner.version>6.85.0</google-cloud-spanner.version>
+        <google-cloud-spanner.version>6.86.0</google-cloud-spanner.version>
     </properties>
 
     <dependencies>