Fix include for catch2 3.1 and above

In Catch2 3.1 and above there are some header files being installed to include/catch2/matchers/ instead of include/catch2/. This PR fixes compilation and I have tested it with Catch2 3.4.

assigned to @clemenci

added lhcb-gaudi-head label

changed milestone to %v37r2

approved this merge request

• [2023-11-03 00:03] Validation started with lhcb-gaudi-head#3732
• [2023-11-03 00:07] Validation started with lhcb-run2-gaudi-head#642
• [2023-11-03 00:17] Validation started with lhcb-sim10-gaudi-head#423
• [2023-11-04 00:03] Validation started with lhcb-gaudi-head#3733
• [2023-11-04 00:11] Validation started with lhcb-run2-gaudi-head#643
• [2023-11-04 00:18] Validation started with lhcb-sim10-gaudi-head#424

approved this merge request

merged

mentioned in commit 110f2189