dependabot: bump com.uber.nullaway:nullaway from 0.12.15 to 0.13.1

Bumps [com.uber.nullaway:nullaway](https://github.com/uber/NullAway) from 0.12.15 to 0.13.1.
- [Release notes](https://github.com/uber/NullAway/releases)
- [Changelog](https://github.com/uber/NullAway/blob/master/CHANGELOG.md)
- [Commits](uber/NullAway@v0.12.15...v0.13.1)

---
updated-dependencies:
- dependency-name: com.uber.nullaway:nullaway
  dependency-version: 0.13.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle

@@ -52,7 +52,7 @@ subprojects { subproject ->
         dependencies {
             errorprone "com.google.errorprone:error_prone_core:2.46.0"
             api libs.jspecify
-            errorprone 'com.uber.nullaway:nullaway:0.12.15'
+            errorprone 'com.uber.nullaway:nullaway:0.13.1'
         }
         tasks.withType(JavaCompile).configureEach {
             options.errorprone {