Fix gcc11 compilation

added bug fix legacy lhcb-run2-patches-dev4 labels

• [2021-09-14 00:43] Validation started with lhcb-run2-patches-dev4#814
• [2021-09-15 00:28] Validation started with lhcb-new-cmake#347
• [2021-09-15 00:42] Validation started with lhcb-run2-patches-dev4#815
• [2021-09-15 00:42] Validation started with lhcb-run2-gaudi-head#192
• [2021-09-15 00:43] Validation started with lhcb-run2-patches#1021
• [2021-09-15 09:46] Validation started with lhcb-run2-gaudi-head#193

removed lhcb-run2-patches-dev4 label

added all-slots label

removed all-slots label

merged

mentioned in commit 71876a97