Fix debug build warning in H5Utils

Addresses https://atlas-sw-build-logs.web.cern.ch/nightlywww/DEVELOPMENTWebArea/ardoc_web_areamain64BE9G13AthenaDbg/ARDOC_Log_2024-11-06T2101/PhysicsAnalysis_AnalysisCommon_HDF5Utils.html

/build/atnight/localbuilds/nightlies/Athena/main/athena/PhysicsAnalysis/AnalysisCommon/HDF5Utils/HDF5Utils/histogram.icc:220:39: warning: comparison of integer expressions of different signedness: 'hssize_t' {aka 'long int'} and 'std::vector<double, std::allocator<double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  220 |       assert(space.getSelectNpoints() == flat.size());

This merge request affects 1 package:

• PhysicsAnalysis/AnalysisCommon/HDF5Utils

This merge request affects 1 file:

• PhysicsAnalysis/AnalysisCommon/HDF5Utils/HDF5Utils/histogram.icc

Could not map the following files to a domain:

• PhysicsAnalysis/AnalysisCommon/HDF5Utils/HDF5Utils/histogram.icc

Adding @dguest as watcher

added analysis-review-required main no-domain review-pending-level-1 labels

CI Result SUCCESS (hash 955e2fff)

	Athena	AnalysisBase	AthAnalysis
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
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removed review-pending-level-1 label

added review-approved label

removed analysis-review-required label

added analysis-review-approved label

merged

mentioned in commit 81ae09a6