Look at upgrading AWS RHEL 7.6 system #4236

RHEL 7.6 is rather out of date now so test-aws-rhel76-armv8-1 should be updated. However it would be good to continue to have one machine to be able to test on the AWS aarch64 Graviton hardware. I would propose that we update/replace this machine with something newer. Maybe RHEL10 if available on AWS without incurring too much extra cost, or we could look at an Ubuntu/CentOS-Stream version.

(Also noting that we have a RHEL8 x64 system at AWS that may be worth consideringing updating/replacing/removing - there is one outstanding issue in this repo about that machine