Bump com.uber.nullaway:nullaway from 0.12.3 to 0.12.4

Bumps [com.uber.nullaway:nullaway](https://github.com/uber/NullAway) from 0.12.3 to 0.12.4.
- [Release notes](https://github.com/uber/NullAway/releases)
- [Changelog](https://github.com/uber/NullAway/blob/master/CHANGELOG.md)
- [Commits](uber/NullAway@v0.12.3...v0.12.4)

---
updated-dependencies:
- dependency-name: com.uber.nullaway:nullaway
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -327,7 +327,7 @@
                         <path>
                             <groupId>com.uber.nullaway</groupId>
                             <artifactId>nullaway</artifactId>
-                            <version>0.12.3</version>
+                            <version>0.12.4</version>
                         </path>
                         <!-- Other annotation processors go here -->
                     </annotationProcessorPaths>