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/
<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/org/imfreedom/keep/talkatu/talkatu/ui">
<file compressed="true">attachmentdialog.ui</file>
<file compressed="true">attachmentpreview.ui</file>
<file compressed="true">editor.ui</file>
<file compressed="true">historyrow.ui</file>
<file compressed="true">linkdialog.ui</file>
<file compressed="true">messageactions.ui</file>
<file compressed="true">toolbar.ui</file>
</gresource>
</gresources>