PYSEC-2026-1482 JupyterLab LaTeX typesetter links did not enforce `noopener` attribute

Links generated with LaTeX typesetters in Markdown files and Markdown cells in JupyterLab and Jupyter Notebook did not include the noopener attribute. This is deemed to have no impact on the default installations. Theoretically users of third-party LaTeX-rendering extensions could find themselves...