Use shared-workflows branch-25.04

[bdice]

This completes the migration to NVKS runners now that all libraries have been tested and rapidsai/shared-workflows#273 has been merged.

xref: https://github.com/rapidsai/build-infra/issues/184

[jameslamb]

A conda-cpp-build job failed here, with a network error.

./build.sh: line 19: hasArg: command not found
Building for the architecture of the GPU in the system...
[1/9] Creating directories for 'rapids-cmake-populate'
[1/9] Performing download step (download, verify and extract) for 'rapids-cmake-populate'
-- Downloading...
   dst='/opt/conda/conda-bld/work/examples/c/build/_deps/rapids-cmake-subbuild/rapids-cmake-populate-prefix/src/branch-25.04.zip'
   timeout='none'
   inactivity timeout='none'
-- Using src='https://github.com/rapidsai/rapids-cmake/archive/refs/heads/branch-25.04.zip'
CMake Error at rapids-cmake-subbuild/rapids-cmake-populate-prefix/src/rapids-cmake-populate-stamp/download-rapids-cmake-populate.cmake:163 (message):
  Each download failed!

    error: downloading 'https://github.com/rapidsai/rapids-cmake/archive/refs/heads/branch-25.04.zip' failed
          status_code: 22
          status_string: "HTTP response code said error"
          log:
          --- LOG BEGIN ---
          Host github.com:443 was resolved.

(build link)

I've restarted it. Unfortunately that job failing means it'll be a few hours until this is mergeable, because the C++ tests jobs here take 1-4 hours to run. (example recent build

[bdice]

/merge