Replace string interpolation deprectaed in PHP 8.2

[ManuelHu]

Pull Request for Issue #38259.

Summary of Changes

Applied the migration script from the PHP RFC to the repository. This replaces th deprecated ${...} interpolation syntax with a longer-supported one (`{$...}).

Testing Instructions

code review, no functional changes

Link to documentations

Please select:

• Documentation link for docs.joomla.org:
• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org:
• No documentation changes for manual.joomla.org needed

[alikon]

I have tested this item ✅ successfully on 6cb6378

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[viocassel]

I have tested this item ✅ successfully on 6cb6378

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[alikon]

RTC

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[laoneo]

Thanks!