Increment build number from 6 to 7

Author: DerThorsten

recipes/recipes_emscripten/pyb2d3/recipe.yaml

@@ -8,7 +8,7 @@ source:
   - git: https://github.com/DerThorsten/pyb2d3.git
     branch: debug_stuff
 build:
-  number: 6
+  number: 7
 outputs:
 - package:
     name: pyb2d3