Fix failing tests on 5.x-dev [no_release]

[lachiebol]

Description

Automated fix for failing tests on 5.x-dev.

• Failing workflow: Plugin Slack Tests
• Failing job(s): UI
• CI run: https://github.com/matomo-org/plugin-Slack/actions/runs/27459023881

Generated by automated-test-fixes.

Issue No

Steps to Replicate the Issue

Checklist

• [✔/✖] Tested locally or on demo2/demo3?
• [✔/✖/NA] New test case added/updated?
• [✔/✖/NA] Are all newly added texts included via translation?
• [✔/✖/NA] Are text sanitized properly? (Eg use of v-text v/s v-html for vue)
• [✔/✖/NA] Version bumped?
• [✔/✖/NA] I have understood, reviewed, and tested all AI outputs before use
• [✔/✖/NA] All AI instructions respect security, IP, and privacy rules
• [✔/✖/NA] Documentation updated?