Assert the pinned Newton release in the wheel install test

The install test pins the exact Newton version the wheel must resolve, and the
literal still named the git-pin build develop carries (1.6.0.dev0). This branch
pins the 1.6.0rc1 release, so the assertion failed in Installation Tests (ARM)
even though the wheel resolved newton==1.6.0rc1 correctly.

Author: hujc7

source/isaaclab/test/install_ci/uv_pip/test_uv_pip_install_isaaclab_all_trains_cartpole.py

@@ -15,8 +15,8 @@
          Reinstall AFTER the wheel install: unsafe-best-match re-resolves torch from PyPI to CPU.)
     - (aarch64 only) export LD_PRELOAD=/lib/aarch64-linux-gnu/libgomp.so.1
 Tests:
-    - python -c "import importlib.metadata as m; assert m.version('newton') == '1.6.0.dev0'"
-        -> verify the wheel resolves the pinned Newton 1.6 development build
+    - python -c "import importlib.metadata as m; assert m.version('newton') == '1.6.0rc1'"
+        -> verify the wheel resolves the pinned Newton release
     - uv run isaaclab train --rl_library rsl_rl --task Isaac-Cartpole-Direct --num_envs 16
         presets=newton_mjwarp --max_iterations 5; uv run isaaclab train --rl_library rsl_rl
         --task Isaac-Cartpole-Camera-Direct --num_envs 16 presets=newton_mjwarp,newton_renderer --max_iterations 2
@@ -57,7 +57,7 @@ def test_uv_pip_install_isaaclab_all_trains_cartpole(self, isaaclab_root, wheel,
             assert result.returncode == 0, f"uv pip install {wheel}[all] failed:\n{result.stdout}\n{result.stderr}"
 
             result = self.run_in_uv_env(
-                ["python", "-c", "import importlib.metadata as m; assert m.version('newton') == '1.6.0.dev0'"],
+                ["python", "-c", "import importlib.metadata as m; assert m.version('newton') == '1.6.0rc1'"],
                 cwd=isaaclab_root,
             )
             assert result.returncode == 0, (