Use the Aztec-Android version with the #845 fix

[hypest]

Fixes #845

This PR updates to a fixed Aztec Android version. No changes on the gutenberg-mobile side.

Aztec-Android PR: wordpress-mobile/AztecEditor-Android#807
WPAndroid PR: wordpress-mobile/WordPress-Android#9614

To test:

1. In the demo app, do a long list, long enough to have a few empty list items here and there
2. Try to add a new item at the end of the list
3. The new list item should be normally created at the end and the caret should be placed on it

[daniloercoli]

I've tested this PR and it seems to work fine.

The tests I run on this PR was to copy one emoji, that is made up by two characters plus the ZWJ between them, taken from here https://emojipedia.org/emoji-zwj-sequences/ , and pasting it in the editor ---> It worked without problem. Also tried rotating the device, adding and removing the emojis, end other tests.

When trying to paste content to list instead I noticed two problems (Not related to this PR since I was able to replicate them in develop):

• The option menu doesn't appear
• Tap long on the caret does make a selection of text (even it there is no visible text on the screen)
  and then option menu appear on the screen.

Video of the problems above: https://cloudup.com/cDVY7Mi5ka0

[hypest]

TIL about the use of ZWJs in emojis! 😰

Great idea trying those out @daniloercoli 🙇 and glad they work 🎉 . Looping back, I added info about this in this comment.

When trying to paste content to list instead I noticed two problems

Would you mind opening tickets for those @daniloercoli ?

[daniloercoli]

LGTM!

[hypest]

This PR works and is green on CI, but the parent wpandroid PR fails because the JS bundling fails on JitPack. That's a problem not related to this PR though so, I'm going to merge and tackle the JitPack issue separately.