Revert "ci: update to nvhpc 25.11"

This reverts commit 6d59072.

Author: awnawab

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
         prec: ['DP', 'SP']
         name:
           - linux gnu-14
-          - linux nvhpc-25.11
+          - linux nvhpc-25.9
           - linux intel-classic
           - linux intel-modern
           - macos
@@ -49,14 +49,14 @@ jobs:
             python-version: '3.11'
             caching: true
 
-          - name: linux nvhpc-25.11
+          - name: linux nvhpc-25.9
             os: ubuntu-22.04
-            compiler: nvhpc-25.11
+            compiler: nvhpc-25.9
             compiler_cc: nvc
             compiler_cxx: nvc++
             compiler_fc: nvfortran
             cmake_options: -DCMAKE_CXX_FLAGS=--diag_suppress177 -DECBUILD_Fortran_FLAGS=-tp=haswell
-            # nvc++ 25.9 and above has a codegen bug where an AVX-512 SCALEFS node is
+            # nvc++ 25.9 has a codegen bug where an AVX-512 SCALEFS node is
             # emitted by an idiom-recognition pass even on non-AVX-512 targets,
             # causing llc to ICE on some GH runner CPUs. Pin -tp=haswell to
             # constrain the target features so the pass cannot emit it.
@@ -167,7 +167,7 @@ jobs:
       if: contains( matrix.compiler, 'nvhpc' )
       shell: bash -eux {0}
       run: |
-        ${ECWAM_TOOLS}/install-nvhpc.sh --prefix /opt/nvhpc --version 25.11
+        ${ECWAM_TOOLS}/install-nvhpc.sh --prefix /opt/nvhpc --version 25.9
         source /opt/nvhpc/env.sh
         echo "${NVHPC_DIR}/compilers/bin"                   >> $GITHUB_PATH
         [ -z ${MPI_HOME+x} ] || echo "MPI_HOME=${MPI_HOME}" >> $GITHUB_ENV