Fixing Psalm for dataPersister

[Roshyo]

No description provided.

[codecov]

Codecov Report

Merging #182 (63578f4) into 0.12.x (44d7fff) will not change coverage.
The diff coverage is n/a.

❗ Current head 63578f4 differs from pull request most recent head ba63b33. Consider uploading reports for the commit ba63b33 to get more accurate results

@@            Coverage Diff            @@
##             0.12.x     #182   +/-   ##
=========================================
  Coverage     38.57%   38.57%           
  Complexity      454      454           
=========================================
  Files            88       88           
  Lines          1470     1470           
=========================================
  Hits            567      567           
  Misses          903      903           

Impacted Files	Coverage Δ
src/Api/DataPersister/GiftCardDataPersister.php	100.00% <ø> (ø)

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