ci: restore windows-latest leg (Uno 2.7.4 with MUMPS fix now on CRAN)

The leg was disabled because the CRAN Uno Windows binary (2.7.3-1) was
built without the MUMPS linear solver, so Ch14's interior-point DNLP
solves errored with "The linear solver MUMPS is unknown". Uno 2.7.4
(resolve dmumps_c via R_GetCCallable; bnaras/Uno#3) is now on CRAN and
its r-release (R 4.6) Windows binary includes MUMPS, so the cross-
platform render check is restored.

Author: bnaras

.github/workflows/publish.yml

@@ -37,13 +37,7 @@ jobs:
         os:
           - ubuntu-latest
           - macos-latest
-          # - windows-latest
-          #   TEMPORARILY DISABLED. Ch14's DNLP solves fail on the current CRAN
-          #   Uno Windows binary (2.7.3-1), whose build omits the MUMPS linear
-          #   solver, so the interior-point path errors with "The linear solver
-          #   MUMPS is unknown". Fixed in Uno 2.7.4 (resolve dmumps_c via
-          #   R_GetCCallable; bnaras/Uno#3, merged). RESTORE this leg once Uno
-          #   2.7.4 is on CRAN.
+          - windows-latest
 
     steps:
       - name: Check out repository