Update Nebius dependency to use version constraint

Replaced the specific Git-based Nebius SDK reference with a version constraint (`nebius>=0.2.0`). This simplifies dependency management and ensures compatibility with future updates of the SDK.

sky/setup_files/dependencies.py

@@ -139,7 +139,7 @@
         # docs instead.
         # 'vsphere-automation-sdk @ git+https://github.com/vmware/[email protected]' pylint: disable=line-too-long
     ],
-    'nebius': ['nebius @ git+https://github.com/nebius/pysdk@876bb16']
+    'nebius': ['nebius>=0.2.0']
 }
 
 extras_require['all'] = sum(extras_require.values(), [])