python3-pystache: remove package

This package is not required by any package in the repository and fails
to build with Python 3.13.

Author: ahesford

srcpkgs/python3-pystache/patches/setup.patch

@@ -737,6 +737,7 @@ replaces="
  python3-pyside2<=5.15.10_1
  python3-pyside<=5.15.0_2
  python3-pyspotify<=2.1.3_5
+ python3-pystache<=0.5.4_8
  python3-sabyenc3<=5.4.4_2
  python3-scikit-video<=1.1.11_6
  python3-shiboken2<=5.15.10_2