DataQualityUtils: Fix compilation with gcc13.

Implicit conversion from json to string can be ambiguous. Use an explicit conversion.

This merge request affects 1 package:

• DataQuality/DataQualityUtils

This merge request affects 1 file:

• DataQuality/DataQualityUtils/src/HanOutputFile.cxx

added DQ master review-pending-level-1 labels

WARNING: big files (>100K) are found in the changeset

124K in file DataQuality/DataQualityUtils/src/HanOutputFile.cxx

CI Result SUCCESS (hash ca84bafd)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 63707]

added review-approved label and removed review-pending-level-1 label

removed review-approved label

added review-pending-level-1 label

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 5582661c

added sweep:ignore label