Log Message:
picom: Update to 8.2

This is a bug fix release of picom

    Fixes assertion failures related to WIN_FLAGS_SHADOW_STALE, see #479
    write-pid-path in configuration file now accepted, see #492
    Pid files are now deleted during shutdown, see #492
    Build fixes for certain platforms, see #501, #502

Thanks to @tryone144, @jialeens, and @niacat