AIX 7.1 to reach end of support after April

[Haroon-Khel]

AIX 7.1 becomes out of support at the end of April https://github.com/adoptium/infrastructure/wiki/End-of-support-date-for-OS-distributions#aix

We have 6 7.1 machines which all need to be upgraded to 7.2, ideally before the end of April else they will likely be offline after April until they are upgraded

test-osuosl-aix715-ppc64-1 test-osuosl-aix715-ppc64-2 build-osuosl-aix71-ppc64-1 build-osuosl-aix71-ppc64-2 test-osuosl-aix715-ppc64-3 test-osuosl-aix715-ppc64-4

ping @aixtools @sxa