MadGraph5Amc : update MG version to 2.9.16.atlas4 including patch requested in ATLMCPROD-10645

MadGraph5Amc : update MG version to 2.9.16.atlas4 including patch requested in ATLMCPROD-10645

added 16 commits

• 29e7e02f...d9b2564a - 15 commits from branch atlas:21.6
• 12003c14 - Merge branch '21.6' into '21.6-mgv'

Compare with previous version

enabled an automatic merge when the pipeline for 12003c14 succeeds

This merge request affects 1 package:

• Projects/AthGeneration

This merge request affects 1 file:

• Projects/AthGeneration/externals/MadGraph5Amc.cmake

Adding @akraszna as watcher

added 21.6 Build review-pending-level-1 labels

CI Result SUCCESS (hash 12003c14)

	AthGeneration
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
AthGeneration: number of compilation errors 0, warnings 4
For experts only: Jenkins output [CI-MERGE-REQUEST-GCC62-CC7 2324]

mentioned in commit 3dfe86bd

merged

added sweep:ignore label