talkatu/talkatu

Update the minimum meson to 0.56.0

2021-08-03, Gary Kramlich
13ee9f88fa95
Update the minimum meson to 0.56.0

Testing Done:
ran `meson --wipe` and `ninja` and verified there were no warnings.

Reviewed at https://reviews.imfreedom.org/r/867/
Talkatu is versioned in [mercurial](https://www.mercurial-scm.org/) and is
available on [keep.imfreedom.org](https://keep.imfreedom.org/talkatu/talkatu).
All contributions are provided via review requests at [reviews.imfreedom.org](https://reviews.imfreedom.org/).