Bump com.uber.nullaway:nullaway from 0.10.19 to 0.10.21

Bumps [com.uber.nullaway:nullaway](https://github.com/uber/NullAway) from 0.10.19 to 0.10.21.
- [Release notes](https://github.com/uber/NullAway/releases)
- [Changelog](https://github.com/uber/NullAway/blob/master/CHANGELOG.md)
- [Commits](uber/NullAway@v0.10.19...v0.10.21)

---
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]>

pom.xml

@@ -90,7 +90,7 @@
     <maven-pitest-plugin.version>1.15.3</maven-pitest-plugin.version>
     <pitest-junit5-plugin.version>1.2.1</pitest-junit5-plugin.version>
     <error-prone.version>2.24.1</error-prone.version>
-    <nullaway.version>0.10.19</nullaway.version>
+    <nullaway.version>0.10.21</nullaway.version>
     <revapi-maven-plugin.version>0.15.0</revapi-maven-plugin.version>
     <revapi-java.version>0.28.1</revapi-java.version>
     <revapi-reporter-json-version>0.5.0</revapi-reporter-json-version>