fix: pin gym environment before new API

examples/environment.yml

 name: wumpus
 channels:
   - conda-forge
+  - nodefaults
 dependencies:
-  - python>=3.6
-  - gym
+  - python>=3.8
+  - gym<=0.22
   - pip
   - pip:
-    - wumpus[gym] @ git+https://gitlab.inf.unibz.it/tessaris/wumpus.git
\ No newline at end of file
+    - wumpus @ https://gitlab.inf.unibz.it/tessaris/wumpus/-/archive/dev/wumpus-dev.zip
\ No newline at end of file

setup.cfg

@@ -13,7 +13,7 @@ include_package_data = True
 packages = find:
 python_requires = >=3.8
 install_requires =
-    gym < 0.22
+    gym <= 0.22
 
 [options.entry_points]
 console_scripts =