Don't use alias template name to define methods

[roystgnr]

Doing so gives us "a declarative nested name specifier cannot name an alias template" errors, at least with recent clang on OSX, and it's breaking the libMesh "Test Mac" CI.

[lindsayad]

This just recently appeared? What was the package change that led this to break in CI?

[roystgnr]

This just recently appeared?

Very recently, because we never got to the point of triggering this in CI until MetaPhysicL make check, which we weren't running until after libMesh make finished, which it wasn't because of the XDR issues fixed in the earlier commits of libMesh/libmesh#4390 - it surely dates back to the CI environment change, though.

What was the package change that led this to break in CI?

Almost certainly, in idaholab/moose#31935, the "Update OSX SDK to 14.5, removing support for OSX Ventura (EOL September 15, 2025)" conda update. No need to use conda to replicate it, though; building with my laptop's default CommandLineTools clang (I believe from the 26.2 SDK?) gave the same warning. I love my 64-core Linux box, but I really need to be running on Mac more regularly than "when I'm on travel or when CI breaks"...