Bump spotbugs.version from 4.9.0 to 4.9.1

Bumps `spotbugs.version` from 4.9.0 to 4.9.1.

Updates `com.github.spotbugs:spotbugs-annotations` from 4.9.0 to 4.9.1
- [Release notes](https://github.com/spotbugs/spotbugs/releases)
- [Changelog](https://github.com/spotbugs/spotbugs/blob/master/CHANGELOG.md)
- [Commits](spotbugs/spotbugs@4.9.0...4.9.1)

Updates `com.github.spotbugs:spotbugs` from 4.9.0 to 4.9.1
- [Release notes](https://github.com/spotbugs/spotbugs/releases)
- [Changelog](https://github.com/spotbugs/spotbugs/blob/master/CHANGELOG.md)
- [Commits](spotbugs/spotbugs@4.9.0...4.9.1)

---
updated-dependencies:
- dependency-name: com.github.spotbugs:spotbugs-annotations
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: com.github.spotbugs:spotbugs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -92,7 +92,7 @@
     <google-java-format.version>1.25.2</google-java-format.version>
     <jacoco.version>0.8.12</jacoco.version>
     <spotbugs-maven-plugin.version>4.8.6.6</spotbugs-maven-plugin.version>
-    <spotbugs.version>4.9.0</spotbugs.version>
+    <spotbugs.version>4.9.1</spotbugs.version>
     <!-- for documentation -->
     <broker.version>4.0</broker.version>
     <!-- to sign artifacts when releasing -->