Update pin for ucx

[regro-cf-autotick-bot]

This PR has been triggered in an effort to update the pin for ucx. The current pinned version is 1.17, the latest available version is 1.18 and the max pin pattern is x.x. This migration will impact 6 feedstocks.

Checklist:

• The new version is a stable supported pin.
• I checked that the ABI changed from 1.17 to 1.18.

**Please note that if you close this PR we presume that the new pin has been rejected.

@conda-forge-admin please ping ucx-split

_{This PR was generated by https://github.com/regro/cf-scripts/actions/runs/12894658123 - please use this URL for debugging.}

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-webservice.

I was asked to ping @conda-forge/ucx-split and so here I am doing that.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[conda-forge-admin]

Hi! This is the friendly conda-forge automerge bot!

I considered the following status checks when analyzing this PR:

• linter: passed
• github-actions: passed

Thus the PR was passing and merged! Have a great day!