Bump com.uber.nullaway:nullaway from 0.12.10 to 0.12.15

Bumps [com.uber.nullaway:nullaway](https://github.com/uber/NullAway) from 0.12.10 to 0.12.15.
- [Release notes](https://github.com/uber/NullAway/releases)
- [Changelog](https://github.com/uber/NullAway/blob/master/CHANGELOG.md)
- [Commits](uber/NullAway@v0.12.10...v0.12.15)

---
updated-dependencies:
- dependency-name: com.uber.nullaway:nullaway
  dependency-version: 0.12.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -124,7 +124,7 @@
             <path>
               <groupId>com.uber.nullaway</groupId>
               <artifactId>nullaway</artifactId>
-              <version>0.12.10</version>
+              <version>0.12.15</version>
             </path>
           </annotationProcessorPaths>
         </configuration>