Updated the bundled Ruby gems rexml and net-imap to patched versions, addressing known vulnerabilities

## Security Security Updated the bundled Ruby gems rexml and net-imap to patched versions, addressing known vulnerabilities. ## Change Change ### 20260816-2330-rc0 Release ## Security Security Updated aiohttp, joblib and cryptography to patched versions, addressing known vulnerabilities including CVE-2022-21797 and CVE-2025-69223. ## Change Change Installed latest packages from upstream dependencies. ## Change Change Updated the CUDA base image from 12.8.1 to 12.9.2 (CUDA 12.9, cuDNN 9.10). This is a minor CUDA 12 update, binary compatible with the previous image, and also addresses known vulnerabilities in a bundled NVIDIA profiler component. ## Security Security Updated the bundled Ruby gems rexml and net-imap to patched versions, addressing known vulnerabilities. ## Deprecate Deprecated Removed the JupyterLab 3 environment from the Python 3.12 custom container; JupyterLab 4 is now the only JupyterLab environment and is always used. The Python 3.10 images are unaffected. ## Change Change ### 20260816-2330-rc0 Release ## Security Security Updated aiohttp, joblib and cryptography to patched versions, addressing known vulnerabilities including CVE-2022-21797 and CVE-2025-69223. ## Change Change Installed latest packages from upstream dependencies. ## Change Change ### 20260816-2230-rc0 Release ## Change Change Installed latest packages from upstream dependencies. ## Change Change ### 20260816-2230-rc0 Release ## Change Change Installed latest packages from upstream dependencies. ## Change Change ### 20260816-2130-rc0 Release ## Change Change Installed latest packages from upstream dependencies. ## Change Change Installed latest packages from upstream dependencies. ## Fix Fixed Fixed the Git panel's grayed out buttons, which were disabled due to an issue with the Jupyter Lab's Git plugin introduced in version 0.54.0. ## Change Change ### 20260816-2030-rc0 Release