Prefer std::abs

This is a follow up on !1516 (merged), because there was still one occurrence of abs instead of std::abs. I also replaced the uses of fabs with std::abs.

changed milestone to %v37r2

added lhcb-gaudi-head label

assigned to @clemenci

• [2023-11-27 14:49] Validation started with lhcb-gaudi-head#3747
• [2023-11-28 00:03] Validation started with lhcb-gaudi-head#3748
• [2023-11-28 00:08] Validation started with lhcb-run2-gaudi-head#658
• [2023-11-28 00:18] Validation started with lhcb-sim10-gaudi-head#433

approved this merge request

mentioned in commit 35d4b626

merged