CxxUtils: Fix compilation with gcc14.

Missing includes.

This merge request affects 1 package:

• Control/CxxUtils

This merge request affects 2 files:

• Control/CxxUtils/Root/StringUtils.cxx
• Control/CxxUtils/test/ConcurrentHashmapImpl_test.cxx

Adding @ssnyder as watcher

added Core main review-pending-level-1 labels

CI Result SUCCESS (hash e3d2b241)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 2880]

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit 29278a2c