feat(android): update libraries, add "zIndex" getter

[m1ga]

• update map-utils (https://github.com/googlemaps/android-maps-utils/releases)
• added getZIndex to make it build with the new version (was added in map-utils 3.2.0)
• match androidx.fragment:fragment version with SDK version

Null check update
My PR into the Google map-utils repo ("null check") was accepted and merged by google 👍 !
That should reduce some random "null errors" in the internal onAnimationUpdate function.

---

Side note:

getColor can be overwritten in TiCluserRenderer now to set custom colors like

    @Override
    public int getColor(int clusterSize) {
        final float hueRange = 220;
        final float sizeRange = 300;
        final float size = Math.min(clusterSize, sizeRange);
        final float hue = (sizeRange - size) * (sizeRange - size) / (sizeRange * sizeRange) * hueRange;
        return Color.HSVToColor(new float[]{
                hue, 1f, .6f
        });
    }

but not part of this PR :)

[hansemannn]

5.5.2 was released in June already. Something is broken here. I will bump it to 5.5.3, but it seems like the last release was not properly tagged

[m1ga]

ok ok. It was distributed with the SDK so that was fine at least. I'll add a PR to the SDK to include those modules

[hansemannn]

Already done :)