Use ARC V2 self-hosted runners for GPU jobs (rapidsai#1410)

This PR is updating the runner labels to use ARC V2 self-hosted runners for GPU jobs. This is needed to resolve the auto-scalling issues.

Authors:
  - Jordan Jacobelli (https://github.com/jjacobelli)

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)

URL: rapidsai#1410

.github/workflows/build.yaml

@@ -60,7 +60,7 @@ jobs:
     uses: rapidsai/shared-action-workflows/.github/workflows/[email protected]
     with:
       build_type: branch
-      node_type: "gpu-latest-1"
+      node_type: "gpu-v100-latest-1"
       arch: "amd64"
       container_image: "rapidsai/ci:latest"
       run_script: "ci/build_docs.sh"

.github/workflows/pr.yaml

@@ -60,7 +60,7 @@ jobs:
     uses: rapidsai/shared-action-workflows/.github/workflows/[email protected]
     with:
       build_type: pull-request
-      node_type: "gpu-latest-1"
+      node_type: "gpu-v100-latest-1"
       arch: "amd64"
       container_image: "rapidsai/ci:latest"
       run_script: "ci/build_docs.sh"