PHP deprecation errors on 8.2.1 DelayJS/html.php file.

[piotrbak]

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Describe the bug
We're getting the following warnings in specific conditions:

[27-Mar-2023 10:07:52 UTC] PHP Deprecated:  Using ${var} in strings is deprecated, use {$var} instead in /shared/httpd/multisite/htdocs/wp-content/plugins/wp-rocket/inc/Engine/Optimization/DelayJS/HTML.php on line 254
[27-Mar-2023 10:07:52 UTC] PHP Deprecated:  Using ${var} in strings is deprecated, use {$var} instead in /shared/httpd/multisite/htdocs/wp-content/plugins/wp-rocket/inc/Engine/Optimization/DelayJS/HTML.php on line 264
[27-Mar-2023 10:07:52 UTC] PHP Deprecated:  Using ${var} in strings is deprecated, use {$var} instead in /shared/httpd/multisite/htdocs/wp-content/plugins/wp-rocket/inc/Engine/Optimization/DelayJS/HTML.php on line 273

Expected behavior
No warnings

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Additional context
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[vmanthos]

There is a deprecation notice when Minify JavaScript Files is enabled:

PHP Deprecated: Use of "parent" in callables is deprecated in /shared/httpd/wprocketest/htdocs/wp-content/plugins/wp-rocket/inc/Dependencies/Minify/JS.php on line 127

@piotrbak Do you want a separate issue about this?

[piotrbak]

@vmanthos we can resolve it here 👍