Unkown Gradle Wrapper JAR file is used

[Ewout ter Hoeven]

Error: Gradle Wrapper Validation Failed!
  See https://github.com/gradle/wrapper-validation-action#reporting-failures
✗ Found unknown Gradle Wrapper JAR files:
  e2b82129ab64751fd40437007bd2f7f2afb3c6e41a9198e628650b22d5824a14 java/gradle/wrapper/gradle-wrapper.jar
✓ Found known Gradle Wrapper JAR files:
  16caeaf66d57a0d1d2087fef6a97efa62de8da69afa5b908f40db35afc4342da kotlin/gradle/wrapper/gradle-wrapper.jar

See https://github.com/EwoutH/arcgis-runtime-samples-android/runs/2141138120?check_suite_focus=true#step:3:5

Fixed by #875.

[TADraeseke]

Thanks for spotting this and for the PR @EwoutH!