[Dependency] Remove direct reference for sphere (#3024)

* [Dependency] Remove direct reference for sphere

The direct reference causes error in our pypi release: https://github.com/skypilot-org/skypilot/actions/runs/7638977430

* Update setup.py

sky/setup_files/setup.py

@@ -238,7 +238,12 @@ def parse_readme(readme: str) -> str:
     'runpod': ['runpod>=1.5.1'],
     'vsphere': [
         'pyvmomi==8.0.1.0.2',
-        'vsphere-automation-sdk @ git+https://github.com/vmware/[email protected]'
+        # vsphere-automation-sdk is also required, but it does not have
+        # pypi release, which cause failure of our pypi release.
+        # https://peps.python.org/pep-0440/#direct-references
+        # We have the instruction for its installation in our
+        # docs instead.
+        # 'vsphere-automation-sdk @ git+https://github.com/vmware/[email protected]'
     ],
 }