easyrpg-player: Update to 0.6.2.3

  This release was unplanned but we introduced a regression in 0.6.2.2 that
  we have to fix. Next time we will be a bit more conservative in
  backporting fixes :(. But this is for-sure the last patch release. The
  next release will be huuuge.

  Regressions fixed

  The implementation of Skill reflection crashed the Player when the skill
  had no target, e.g. when it was a skill that just toggled a switch. This
  broke directly the first battle in OFF. (#2342)

  Battle

  The correct default state rank B instead of C is now used for enemy damage
  calculation. (#2332)

  Damage calculation for states is now more correct: The damage/recovery is
  rounded down. (#2343)

  For Developers

  The Player compiles now on the Haiku operating system. (#2359)

  When using vcpkg and CMake 3.15 or newer the detection whether a shared or
  a static runtime (/MD vs /MT) shall be used is now autodetected via
  MSVC_RUNTIME_LIBRARY. (#2267)

  CMake will not download the TestGame via git anymore. The motivation here
  was years ago that we want to use the TestGame for unit and regression
  testing but this never happened.

(nia)