use cpu8 GHA runners

Author: trxcllnt

.github/workflows/build.yaml

@@ -39,7 +39,7 @@ jobs:
       build_type: ${{ inputs.build_type || 'branch' }}
       branch: ${{ inputs.branch }}
       date: ${{ inputs.date }}
-      node_type: cpu16
+      node_type: cpu8
       script: ci/build_cpp.sh
       sha: ${{ inputs.sha }}
       sccache-dist-token-secret-name: GIST_REPO_READ_ORG_GITHUB_TOKEN

.github/workflows/pr.yaml

@@ -38,7 +38,7 @@ jobs:
     uses: rapidsai/shared-workflows/.github/workflows/conda-cpp-build.yaml@main
     with:
       build_type: pull-request
-      node_type: cpu16
+      node_type: cpu8
       script: ci/build_cpp.sh
       sccache-dist-token-secret-name: GIST_REPO_READ_ORG_GITHUB_TOKEN
   devcontainer: