Bump the requirements group across 1 directory with 2 updates (#2987)

Bumps the requirements group with 2 updates in the / directory: [ipywidgets](https://github.com/jupyter-widgets/ipywidgets) and [pymongo](https://github.com/mongodb/mongo-python-driver).


Updates `ipywidgets` from 8.1.5 to 8.1.6
- [Release notes](https://github.com/jupyter-widgets/ipywidgets/releases)
- [Commits](jupyter-widgets/ipywidgets@8.1.5...8.1.6)

Updates `pymongo` from 4.11.3 to 4.12.0
- [Release notes](https://github.com/mongodb/mongo-python-driver/releases)
- [Changelog](https://github.com/mongodb/mongo-python-driver/blob/master/doc/changelog.rst)
- [Commits](mongodb/mongo-python-driver@4.11.3...4.12.0)

---
updated-dependencies:
- dependency-name: ipywidgets
  dependency-version: 8.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: requirements
- dependency-name: pymongo
  dependency-version: 4.12.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: requirements
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements_dev_optional.txt

@@ -3,12 +3,12 @@
 lmdb==1.6.2; sys_platform != 'win32'
 # optional library requirements for Jupyter
 ipytree==0.2.2
-ipywidgets==8.1.5
+ipywidgets==8.1.6
 azure-storage-blob==12.24.1
 redis==5.2.1
 types-redis
 types-setuptools
-pymongo==4.11.3
+pymongo==4.12.0
 # optional test requirements
 coverage
 pytest-cov==6.1.1