community/neovim: upgrade to 0.10.0
https://neovim.io/doc/user/news-0.10.html https://neovim.io/doc/user/deprecated.html#deprecated-0.10
- neovim 0.10.0 has a run-time dependency on lua-lpeg.
- enabled tests, not sure if test/package is the right target
- maybe post-upgrade should also warn that there are many new deprecations?