Modernize NVHPC CI job (to make it working again): Ubuntu-24.04 runner, NVHPC 25.11

.github/workflows/ci.yml

@@ -470,10 +470,10 @@ jobs:
 
 
   # Testing on Ubuntu + NVHPC (previous PGI) compilers, which seems to require more workarounds
-  ubuntu-nvhpc7:
+  ubuntu-nvhpc:
     if: github.event.pull_request.draft == false
-    runs-on: ubuntu-22.04
-    name: "🐍 3 • NVHPC 23.5 • C++17 • x64"
+    runs-on: ubuntu-24.04
+    name: "🐍 3 • NVHPC 25.11 • C++17 • x64"
     timeout-minutes: 90
 
     env:
@@ -491,7 +491,7 @@ jobs:
       run: |
         sudo apt-get update -y && \
         sudo apt-get install -y cmake environment-modules git python3-dev python3-pip python3-numpy && \
-        sudo apt-get install -y --no-install-recommends nvhpc-23-5 && \
+        sudo apt-get install -y --no-install-recommends nvhpc-25-11 && \
         sudo rm -rf /var/lib/apt/lists/*
         python3 -m pip install --upgrade pip
         python3 -m pip install --upgrade pytest
@@ -502,15 +502,15 @@ jobs:
       shell: bash
       run: |
         source /etc/profile.d/modules.sh
-        module load /opt/nvidia/hpc_sdk/modulefiles/nvhpc/23.5
+        module load /opt/nvidia/hpc_sdk/modulefiles/nvhpc/25.11
         cmake -S . -B build -DDOWNLOAD_CATCH=ON \
                             -DCMAKE_CXX_STANDARD=17 \
                             -DPYTHON_EXECUTABLE=$(python3 -c "import sys; print(sys.executable)") \
                             -DCMAKE_CXX_FLAGS="-Wc,--pending_instantiations=0" \
                             -DPYBIND11_TEST_FILTER="test_smart_ptr.cpp"
 
     - name: Build
-      run: cmake --build build -j 2 --verbose
+      run: cmake --build build -j $(nproc) --verbose
 
     - name: Python tests
       run: cmake --build build --target pytest