Dictionary changes size during iteration (probably on rebuild)

[gtfierro]

Traceback (most recent call last):
  File "/Users/user/repositories/Brick/generate_brick.py", line 1025, in <module>
    env.refresh()
  File "/Users/user/repositories/Brick/brickvenv/lib/python3.10/site-packages/ontoenv/__init__.py", line 98, in refresh
    for uri, filename in self.mapping.items():
RuntimeError: dictionary changed size during iteration 

[gtfierro]

Fixed in recent commit