specify typing_extensions version range on dependencies.py

[SeungjinYang]

I am observing smoke test failure of the type:

2025-10-07 11:27:24 PDT | $ pytest tests/smoke_tests/test_cluster_job.py::test_container_logs_multinode_kubernetes --kubernetes --dependency kubernetes
-- | --
  | 2025-10-07 11:27:25 PDT | ImportError while loading conftest '/home/buildkite/.buildkite-agent/builds/kind/18-207-121-73-buildkite-kind4-1/skypilot-1/smoke-tests/tests/conftest.py'.
  | 2025-10-07 11:27:25 PDT | tests/conftest.py:14: in <module>
  | 2025-10-07 11:27:25 PDT | from smoke_tests import smoke_tests_utils
  | 2025-10-07 11:27:25 PDT | tests/smoke_tests/smoke_tests_utils.py:20: in <module>
  | 2025-10-07 11:27:25 PDT | import sky
  | 2025-10-07 11:27:25 PDT | sky/__init__.py:85: in <module>
  | 2025-10-07 11:27:25 PDT | from sky import backends
  | 2025-10-07 11:27:25 PDT | sky/backends/__init__.py:2: in <module>
  | 2025-10-07 11:27:25 PDT | from sky.backends.backend import Backend
  | 2025-10-07 11:27:25 PDT | sky/backends/backend.py:5: in <module>
  | 2025-10-07 11:27:25 PDT | from sky.usage import usage_lib
  | 2025-10-07 11:27:25 PDT | sky/usage/usage_lib.py:17: in <module>
  | 2025-10-07 11:27:25 PDT | from sky import skypilot_config
  | 2025-10-07 11:27:25 PDT | sky/skypilot_config.py:73: in <module>
  | 2025-10-07 11:27:25 PDT | from sky.utils import common_utils
  | 2025-10-07 11:27:25 PDT | sky/utils/common_utils.py:26: in <module>
  | 2025-10-07 11:27:25 PDT | from sky import models
  | 2025-10-07 11:27:25 PDT | sky/models.py:9: in <module>
  | 2025-10-07 11:27:25 PDT | import pydantic
  | 2025-10-07 11:27:25 PDT | /home/buildkite/buildkite-envs/python-client/lib/python3.10/site-packages/pydantic/__init__.py:5: in <module>
  | 2025-10-07 11:27:25 PDT | from ._migration import getattr_migration
  | 2025-10-07 11:27:25 PDT | /home/buildkite/buildkite-envs/python-client/lib/python3.10/site-packages/pydantic/_migration.py:4: in <module>
  | 2025-10-07 11:27:25 PDT | from pydantic.warnings import PydanticDeprecatedSince20
  | 2025-10-07 11:27:25 PDT | /home/buildkite/buildkite-envs/python-client/lib/python3.10/site-packages/pydantic/warnings.py:5: in <module>
  | 2025-10-07 11:27:25 PDT | from .version import version_short
  | 2025-10-07 11:27:25 PDT | /home/buildkite/buildkite-envs/python-client/lib/python3.10/site-packages/pydantic/version.py:7: in <module>
  | 2025-10-07 11:27:25 PDT | from pydantic_core import __version__ as __pydantic_core_version__
  | 2025-10-07 11:27:25 PDT | /home/buildkite/buildkite-envs/python-client/lib/python3.10/site-packages/pydantic_core/__init__.py:6: in <module>
  | 2025-10-07 11:27:25 PDT | from typing_extensions import Sentinel
  | 2025-10-07 11:27:25 PDT | E   ImportError: cannot import name 'Sentinel' from 'typing_extensions' (/home/buildkite/buildkite-envs/python-client/lib/python3.10/site-packages/typing_extensions.py)
  | 2025-10-07 11:27:25 PDT | 🚨 Error: The command exited with status 4

Supposedly Sentinel is available on typing_extensions>=4.6.0, so trying a constraint on the version in dependencies.py should help.

Tested (run the relevant ones):

• Code formatting: install pre-commit (auto-check on commit) or bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: /smoke-test (CI) or pytest tests/test_smoke.py (local)
• Relevant individual tests: /smoke-test -k test_name (CI) or pytest tests/test_smoke.py::test_name (local)
• Backward compatibility: /quicktest-core (CI) or pytest tests/smoke_tests/test_backward_compat.py (local)

[SeungjinYang]

/smoke-test --kubernetes --dependency kubernetes -k test_container_logs_multinode_kubernetes

[SeungjinYang]

/smoke-test --kubernetes -k test_container_logs_multinode_kubernetes

[SeungjinYang]

/smoke-test --kubernetes --dependency kubernetes -k test_container_logs_multinode_kubernetes