Fix flaky test_bindings test

For some reason, importing the SWIG package gympp_bindings from gym_ignition interferes with other tests

tests/python/test_bindings.py

@@ -8,8 +8,8 @@
 import numpy as np
 from numpy import pi
 from pathlib import Path
+import gympp_bindings as bindings
 from gym_ignition.utils import logger
-from gym_ignition import gympp_bindings as bindings
 
 # Set verbosity
 logger.set_level(gym.logger.DEBUG)
@@ -109,7 +109,7 @@ def test_box_space():
  "Wrong data type of the sample extracted from the box space"
  assert box.contains(sample), \
  "Sampled data is not contained in the box space object that created it"
- 
+
 
 def test_space_box_metadata(create_space_box_md):
  md = create_space_box_md