Updates starlette to 0.49.1 due to security vulnerability (#4133)

# Description

Updates starlette to 0.49.1 due to security vulnerability in the
previously used 0.45.3.

## Type of change

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applicable. -->

- Bug fix (non-breaking change which fixes an issue)

## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

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- [ ] I have not done this task
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source/isaaclab/setup.py

@@ -37,7 +37,7 @@ INSTALL_REQUIRES = [
     # make sure this is consistent with isaac sim version
     "pillow==11.3.0",
     # livestream
-    "starlette==0.45.3",
+    "starlette==0.49.1",
     # testing
     "pytest",
     "pytest-mock",