Use oasis3-mct master branch in ACCESS-ESM1.6#311

dougiesquire merged 2 commits intomainACCESS-NRI/access-spack-packages:mainfrom

esm1.6-oasis3-mct-masterACCESS-NRI/access-spack-packages:esm1.6-oasis3-mct-masterCopy head branch name to clipboard