fix(deps): update gix for markdown SVG rendering (#7313)

# Motivation

dfinity/gix-components#707 fixed an issue on how
`svg` are render as part of code blocks in the Markdown component.

This issue has arisen with the II proposal that was rendered incorrectly
in the nns-dapp, causing problems when attempting to validate the
payload.
* https://dashboard.internetcomputer.org/proposal/138188
*
https://nns.ic0.app/proposal/?u=qoctq-giaaa-aaaaa-aaaea-cai&proposal=138188

This PR fixes it as shown in the following screenshot:

<img width="809" height="633" alt="Screenshot 2025-08-29 at 11 25 39"
src="https://github.com/user-attachments/assets/37bf5cad-b56a-4a36-8e3e-65f4d4b80cc9"
/>

[NNS1-4082](https://dfinity.atlassian.net/browse/NNS1-4082)

# Changes

- Bump gix to latest.

# Tests

- Validate the payload with the new rendering output and getting
`1c18791e243e9c00cfb124320df7b11a216660cf9f9616a39e8565f62f3a2236`

[NNS1-4082]:
https://dfinity.atlassian.net/browse/NNS1-4082?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: yhabib