Modified nic-performance test to download a smaller file (#253)

[ROCm/rocprofiler-systems commit: 4346c1c217]

projects/rocprofiler-systems/tests/rocprof-sys-nic-perf.cmake

@@ -49,9 +49,9 @@ set(_nic_perf_environment
     "ROCPROFSYS_SAMPLING_DELAY=0.05")
 
 # Set _download_url to a large file that will give rocprof-sys-sample time to collect NIC
-# performance data.
+# performance data (but not too large, because each test will time out after 2 min).
 set(_download_url
-    "https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.0/clang+llvm-20.1.0-armv7a-linux-gnueabihf.tar.gz"
+    "https://github.com/ROCm/rocprofiler-systems/releases/download/rocm-6.4.1/rocprofiler-systems-1.0.1-ubuntu-22.04-ROCm-60400-PAPI-OMPT-Python3.sh"
     )
 
 # Run the NIC performance test