fix: bump error_prone_annotations from 2.16 to 2.18.0

Bumps [error_prone_annotations](https://github.com/google/error-prone) from 2.16 to 2.18.0.
- [Release notes](https://github.com/google/error-prone/releases)
- [Commits](google/error-prone@v2.16...v2.18.0)

---
updated-dependencies:
- dependency-name: com.google.errorprone:error_prone_annotations
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle

@@ -29,7 +29,7 @@ allprojects {
     ext.obl_android_app_versionCode = obl_android_app_buildNumber.toInteger()
 
     ext.obl_guavaVersion = '31.1-android'
-    ext.obl_errorProneVersion = '2.16'
+    ext.obl_errorProneVersion = '2.18.0'
 
     // must stay at 3.12.x until minsdk >= 25
     ext.obl_okhttpVersion = '3.12.13'