PHP 8.2 compatiblity

Problem/Motivation

PHP 8.2 will throw these warnings:

Deprecated: Using ${var} in strings is deprecated, use {$var} instead

One of these has been addressed in #3395400: PHP 8.2 Deprecation messages at ./src/Plugin/views/style/ViewsBootstrapGrid.php, but additional issues may exist across the different versions.

Proposed resolution

Check all branches (3,4,5) for this syntax and replace.