Update gradle tools version, update CI image

[tobrun]

No description provided.

[osana]

@tobrun The problem in CI seems similar to the one I had in gl-native:
:MapboxGLAndroidSDKLint:jar UP-TO-DATE
/src/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/attribution/AttributionParser.java:71: error: unmappable character for encoding ASCII
StringBuilder stringBuilder = new StringBuilder(withCopyrightSign ? “” : “?? “);

here is what worked mapbox/mapbox-gl-native#13384

[tobrun]

@osana forgot about that fix but in the meantime I just addressed the encoding issues. You can replace them by searching for the html entity equivalent online.