Refactor MTE-4104 Bump slack-github-actions

[clarmso]

📜 Tickets

Jira ticket

💡 Description

I have bumped the slack-github-actions for the following workflows:

Update credential provider script: https://github.com/mozilla-mobile/firefox-ios/actions/runs/12817446716
Firefox UI Tests: https://github.com/mozilla-mobile/firefox-ios/actions/runs/12817432000
Build and Run Autofill Automation: https://github.com/mozilla-mobile/firefox-ios/actions/runs/12817427793
Fetch Remote Settings: https://github.com/mozilla-mobile/firefox-ios/actions/runs/12817491647

Note: "Update credential provider script" has been failing for the past month. To be investigated.

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed, I updated documentation / comments for complex code and public methods
• If needed, added a backport comment (example @Mergifyio backport release/v120)

[mobiletest-ci-bot]

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