chore(deps): update mcr.microsoft.com/devcontainers/universal docker tag to v6

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
mcr.microsoft.com/devcontainers/universal	image	major	2 → 6

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[gemini-code-assist]

Code Review

This pull request updates the dev container image version from 2 to 6. A review comment highlights that this upgrade to an Ubuntu 24.04-based image will cause pip installation failures due to PEP 668 ('Externally Managed Environments') restrictions, necessitating changes to how dependencies are installed.

[gemini-code-assist]

Updating to version 6 (based on Ubuntu 24.04) will cause the updateContentCommand on line 7 to fail. Ubuntu 24.04 enforces PEP 668 ('Externally Managed Environments'), which prevents pip from installing packages into the system Python environment. To resolve this, the command should be updated to use a virtual environment or include the --break-system-packages flag. Additionally, pinned dependencies like torchvision==0.16.2 in requirements.txt may require updates to maintain compatibility with the default Python 3.12 environment provided by this image.