fix: requirements-dev.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-JUPYTERSERVER-17152947
- https://snyk.io/vuln/SNYK-PYTHON-JUPYTERSERVER-17391532
- https://snyk.io/vuln/SNYK-PYTHON-TORNADO-17356157

Author: snyk-bot

requirements-dev.txt

@@ -42,3 +42,5 @@ sphinx-autodoc-typehints
 pickleshare
 jupyterlab>=4.4.8 # not directly required, pinned by Snyk to avoid a vulnerability
 zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability
+jupyter-server>=2.20.0 # not directly required, pinned by Snyk to avoid a vulnerability
+tornado>=6.5.7 # not directly required, pinned by Snyk to avoid a vulnerability