Update GitHub Actions workflows. (#816)

This PR was triggered by @t0yv0 generated by the
update-workflows-ecosystem-providers workflow in the pulumi/ci-mgmt
repo, from commit
[b05dbe61dbea8fb6ea0c4cde662bde1101961819](b05dbe61db).

Co-authored-by: Pulumi Bot <bot@pulumi.com>

.github/actions/download-sdk/action.yml

@@ -10,7 +10,7 @@ runs:
   using: "composite"
   steps:
     - name: Download SDK
-      uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+      uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
       with:
         name: ${{ inputs.language }}-sdk.tar.gz
         path: ${{ github.workspace }}/sdk/