fixing php8.2 string usage

[brettmc]

This resolves some deprecation warnings in php 8.2:
Deprecated: Using ${var} in strings is deprecated, use {$var} instead

[codecov]

Codecov Report

Merging #810 (a99ec16) into main (2cb5d6b) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #810   +/-   ##
=========================================
  Coverage     82.88%   82.88%           
  Complexity     1829     1829           
=========================================
  Files           225      225           
  Lines          4697     4697           
=========================================
  Hits           3893     3893           
  Misses          804      804           

Flag	Coverage Δ
7.4	82.89% <ø> (ø)
8.0	82.91% <ø> (ø)
8.1	82.91% <ø> (ø)

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