Mpv: raise required library version to 2.2.0 (mpv 0.37.0) to avoid threading issues

While testing the new libmpv backend it was noticed that the libmpv version currently shipped in Neon caused lockups. This was traced back to a problem with threads usage in mpv first fixed in this commit https://github.com/mpv-player/mpv/commit/174df99ffa53f1091589eaa4fa0c16cdd55a9326 (related PR: https://github.com/mpv-player/mpv/pull/12709) So, in this MR we raise the required library version to 2.2.0 (mpv 0.37.0) to avoid threading issues.

Neon is currently based on ubuntu 22.04 and ships mpv 0.34 / libmpv 1.109.0. In the future Neon will be based on ubuntu 24.04 and it will ship mpv 0.37 / libmpv 0.2.2.