fix: #3564838 Adapt placeholderEscape to safely cast values to string

Rachid Elfakharrequested to merge
issue/drupal-3564838:3564838-Cast-values-to-string-in-placeholderEscape into 11.x

By: geek-merlin By: solimanharkas (cherry picked from commit 6c68fad3)

Closes #3564838

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