Bump the pytorch group across 1 directory with 2 updates

Bumps the pytorch group with 2 updates in the /pytorch directory: [jupyterlab](https://github.com/jupyterlab/jupyterlab) and [notebook](https://github.com/jupyter/notebook).


Updates `jupyterlab` from 4.3.0b2 to 4.3.0rc0
- [Release notes](https://github.com/jupyterlab/jupyterlab/releases)
- [Changelog](https://github.com/jupyterlab/jupyterlab/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jupyterlab/jupyterlab/compare/@jupyterlab/lsp@4.3.0-beta.2...@jupyterlab/lsp@4.3.0-rc.0)

Updates `notebook` from 7.3.0a1 to 7.3.0b0
- [Release notes](https://github.com/jupyter/notebook/releases)
- [Changelog](https://github.com/jupyter/notebook/blob/main/CHANGELOG.md)
- [Commits](https://github.com/jupyter/notebook/compare/@jupyter-notebook/tree@7.3.0-alpha.1...@jupyter-notebook/tree@7.3.0-beta.0)

---
updated-dependencies:
- dependency-name: jupyterlab
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: pytorch
- dependency-name: notebook
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: pytorch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pytorch/jupyter-requirements.txt

@@ -1,4 +1,4 @@
-jupyterlab==4.3.0b2
+jupyterlab==4.3.0rc0
 jupyterhub==5.2.0
-notebook==7.3.0a1
+notebook==7.3.0b0
 jupyter-server-proxy>=4.1.2