Support Bedrock version 1.20.71

[rschuiling]

Is your feature request related to a problem? Please describe.
I was able to pick the new version after enabling the 'unsupported versions' in Options / Dev. But after downloading, it will not launch but shows an error about being unsupported. Referring that support should be added starting with a feature request. Here it is :-)

Describe the solution you'd like
I would like to be able to use this version 1.20.71.

Describe alternatives you've considered
None.

Additional context
None.

[ChristopherHX]

It landed in the nightly channel (see readme). Testing is not complete, since mojang surprised me by a zero day breaking change (1.20.70 beta works in the release).