gitlab-ci: Select CUDA version explicitly in NVHPC job

The job added by commit 16a5c36795 (gitlab-ci: add nightly job testing
NVHPC with Ninja on Linux, 2022-11-21) started failing after CI hosts
were updated from NVIDIA driver version 520 to version 525.  Somehow
this causes the NVHPC multi-cuda `nvcc` wrapper to select CUDA 10.2
instead of 11.7 as with older driver versions.

As a workaround, add the preferred version of `nvcc` to the PATH.

Issue: #24225

.gitlab/ci/env_nvhpc_ninja.sh

@@ -3,3 +3,7 @@ export CXX=nvc++
 export FC=nvfortran
 export CUDACXX=nvcc
 export CUDAHOSTCXX=nvc++
+# FIXME(#24225): /opt/nvidia/hpc_sdk/Linux_x86_64/22.9/compilers/bin/nvcc
+# selects a CUDA version 10.2 with host driver versions > 520.
+# Manually select the preferred nvcc version.
+export PATH=/opt/nvidia/hpc_sdk/Linux_x86_64/22.9/cuda/11.7/bin:$PATH