[hist] Add backwards-compatibility for THnSparseL typedef
Fixes #15874
Test Results
12 files 12 suites 2d 18h 6m 27s :stopwatch: 3 024 tests 3 022 :white_check_mark: 0 :zzz: 2 :x: 31 207 runs 31 201 :white_check_mark: 0 :zzz: 6 :x:
For more details on these failures, see this check.
Results for commit 98a9947a.
:recycle: This comment has been updated with latest results.
Added backwards-compatibility test in roottest, will wait for the CI to run.
Maybe we can proceed with the merge and backport to 6.32? This would prepare us to the next patch release...
Failures are unrelated, merging this PR due to its relevance for the upcoming patch release.