Bump error_prone_core from 2.11.0 to 2.12.1

Bumps [error_prone_core](https://github.com/google/error-prone) from 2.11.0 to 2.12.1.
- [Release notes](https://github.com/google/error-prone/releases)
- [Commits](google/error-prone@v2.11.0...v2.12.1)

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

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

app/build.gradle

@@ -176,7 +176,7 @@ dependencies {
   androidTestImplementation "androidx.test.espresso:espresso-intents:${espressoVersion}"
   androidTestImplementation "androidx.test.ext:junit:${androidxJunitExtVersion}"
 
-  errorprone 'com.google.errorprone:error_prone_core:2.11.0'
+  errorprone 'com.google.errorprone:error_prone_core:2.12.1'
 
   // Number Picker
   implementation 'io.github.ShawnLin013:number-picker:2.4.13'