Change box2d requirements from box2d-py to box2d (#1474)

Author: emilemarcotte

pyproject.toml

@@ -34,7 +34,7 @@ dynamic = ["version"]
 [project.optional-dependencies]
 # Update dependencies in `all` if any are added or removed
 atari = ["ale_py >=0.9"]
-box2d = ["box2d-py ==2.3.5", "pygame >=2.1.3", "swig ==4.*"]
+box2d = ["box2d ==2.3.10", "pygame >=2.1.3", "swig ==4.*"]
 classic-control = ["pygame >=2.1.3"]
 classic_control = ["pygame >=2.1.3"]  # kept for backward compatibility
 mujoco = ["mujoco >=2.1.5", "imageio >=2.14.1", "packaging >=23.0"]
@@ -61,7 +61,7 @@ all = [
     # atari
     "ale_py >=0.9",
     # box2d
-    "box2d-py ==2.3.5",
+    "box2d ==2.3.10",
     "pygame >=2.1.3",
     "swig ==4.*",
     # classic-control