GaudiPython: flake8 fixes

flake8 fixes for GaudiPython.

added lhcb-gaudi-head label

changed milestone to %v36r13

assigned to @clemenci

• [2023-04-19 00:05] Validation started with lhcb-gaudi-head#3536
• [2023-04-19 00:12] Validation started with lhcb-run2-gaudi-head#497
• [2023-04-20 00:05] Validation started with lhcb-gaudi-head#3537
• [2023-04-20 00:24] Validation started with lhcb-run2-gaudi-head#498
• [2023-04-21 00:06] Validation started with lhcb-gaudi-head#3538
• [2023-04-21 00:14] Validation started with lhcb-run2-gaudi-head#499
• [2023-04-22 00:06] Validation started with lhcb-gaudi-head#3539
• [2023-04-23 00:04] Validation started with lhcb-gaudi-head#3540
• [2023-04-23 00:12] Validation started with lhcb-run2-gaudi-head#500
• [2023-04-24 00:05] Validation started with lhcb-gaudi-head#3541
• [2023-04-24 00:15] Validation started with lhcb-run2-gaudi-head#501

approved this merge request

merged

mentioned in commit d90ab6ed