[CI] Remove matplotlib from broken recipes

Because the updated `matplotlib` recipe could work now...let's test it

Author: opacam

ci/constants.py

@@ -74,7 +74,6 @@ class TargetPython(Enum):
     # mpmath package with a version >= 0.19 required
     'sympy',
     'vlc',
-    'matplotlib',  # https://github.com/kivy/python-for-android/issues/1900
 ])
 
 BROKEN_RECIPES = {