Proposal: use upstream UFL instead of our fork (#4344)

Author: connorjward

pyproject.toml

@@ -20,7 +20,7 @@ dependencies = [
   "mpi4py>3; python_version >= '3.13'",
   "mpi4py; python_version < '3.13'",
   # TODO RELEASE: use releases
-  "fenics-ufl @ git+https://github.com/firedrakeproject/ufl.git",
+  "fenics-ufl @ git+https://github.com/FEniCS/ufl.git",
   "firedrake-fiat @ git+https://github.com/firedrakeproject/fiat.git",
   "h5py>3.12.1",
   "libsupermesh",