Bump com.github.spotbugs:spotbugs-annotations from 4.9.3 to 4.9.4

Bumps [com.github.spotbugs:spotbugs-annotations](https://github.com/spotbugs/spotbugs) from 4.9.3 to 4.9.4.
- [Release notes](https://github.com/spotbugs/spotbugs/releases)
- [Changelog](https://github.com/spotbugs/spotbugs/blob/master/CHANGELOG.md)
- [Commits](spotbugs/spotbugs@4.9.3...4.9.4)

---
updated-dependencies:
- dependency-name: com.github.spotbugs:spotbugs-annotations
  dependency-version: 4.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

log4j-parent/pom.xml

@@ -137,7 +137,7 @@
     <osgi.annotation.versioning.version>1.1.2</osgi.annotation.versioning.version>
     <pax-exam.version>4.14.0</pax-exam.version>
     <plexus-utils.version>3.6.0</plexus-utils.version>
-    <spotbugs-annotations.version>4.9.3</spotbugs-annotations.version>
+    <spotbugs-annotations.version>4.9.4</spotbugs-annotations.version>
     <system-stubs.version>2.1.8</system-stubs.version>
     <velocity.version>1.7</velocity.version>
     <xmlunit.version>2.10.3</xmlunit.version>