IOVDbSvc: Remove deprecated retrieve of DataHandle.

Retrieving a DataHandle is deprecated. This will give a thread-safety warning soon, so change it to an ordinary retrieve.

This merge request affects 1 package:

• Database/IOVDbSvc

Adding @ssnyder as watcher

added Database master review-pending-level-1 labels

CI Result SUCCESS (hash f9f136fe)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 7255]

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

merged

mentioned in commit 74dfa367

added sweep:ignore label