Build oasis3-mct from master branch

Author: dougiesquire

spack.yaml

@@ -25,7 +25,7 @@ spack:
         - '@git.2024.05.28=access-esm1.5'
     oasis3-mct:
       require:
-        - '@git.access-esm1.5-2025.03.001=access-esm1.5'
+        - '@git.2025.03.001=access-esm1.5'
     openmpi:
       require:
         - '@4.1.5'