ChangeDetection Update: Update also Browsers

[Niklas04]

✍️ Description

In ChangeDetection-Script (ct/changedetection.sh):

• Update also browsers in function update_script
• Adding more messages in function update_script
• Make function update_script more readable by adding line breaks

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• Related Issue: ChangeDetection: ECONNREFUSED after updating via script #1026

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🛠️ Type of Change

Please check the relevant option(s):

• Bug fix (non-breaking change that resolves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change unexpectedly)
• New script (a fully functional and thoroughly tested script or set of scripts)

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✅ Prerequisites

The following steps must be completed for the pull request to be considered:

• Self-review performed (I have reviewed my code to ensure it follows established patterns and conventions.)
• Testing performed (I have thoroughly tested my changes and verified expected functionality.)
• Documentation updated (I have updated any relevant documentation)

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📋 Additional Information (optional)

Fix an issue (#1026) that Browserless-service is not starting up after an update of Broswerless and/or Playwright, because now chromium_headless is needed and/or the installed version of the browsers are not compatible anymore.

This fix was verified by me by upgrading from a working backup. Also could reproduce the issue when updating from the working backup beforehand.