[Dependency] Relax torchrl dependency constraint for main

Author: matteobettini

setup.py

@@ -46,7 +46,7 @@ def get_version():
     url="https://github.com/facebookresearch/BenchMARL",
     author="Matteo Bettini",
     author_email="[email protected]",
-    install_requires=["torchrl==0.4.0", "tqdm", "hydra-core"],
+    install_requires=["torchrl>=0.4.0", "tqdm", "hydra-core"],
     extras_require={
         "vmas": ["vmas>=1.3.4"],
         "pettingzoo": ["pettingzoo[all]>=1.24.3"],