PHP 8.2 compatibility: ${} string interpolation deprecated

[andypost]

https://php.watch/versions/8.2/$%7Bvar%7D-string-interpolation-deprecated

Ref drush-ops/drush#5168

[codecov]

Codecov Report

Merging #56 (1d73379) into main (0c15841) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 1d73379 differs from pull request most recent head f9ad32b. Consider uploading reports for the commit f9ad32b to get more accurate results

@@            Coverage Diff            @@
##               main      #56   +/-   ##
=========================================
  Coverage     86.93%   86.93%           
  Complexity      166      166           
=========================================
  Files            15       15           
  Lines           375      375           
=========================================
  Hits            326      326           
  Misses           49       49           

Impacted Files	Coverage Δ
src/Util/ArrayUtil.php	100.00% <100.00%> (ø)
src/Util/ConfigFallback.php	91.66% <100.00%> (ø)
src/Util/ConfigMerge.php	90.90% <100.00%> (ø)

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[greg-1-anderson]

Thanks!