Bump NVIDIA/holodeck from 0.2.6 to 0.2.15

Bumps [NVIDIA/holodeck](https://github.com/nvidia/holodeck) from 0.2.6 to 0.2.15.
- [Release notes](https://github.com/nvidia/holodeck/releases)
- [Commits](NVIDIA/holodeck@v0.2.6...v0.2.15)

---
updated-dependencies:
- dependency-name: NVIDIA/holodeck
  dependency-version: 0.2.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -31,7 +31,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Set up Holodeck
-      uses: NVIDIA/[email protected].6
+      uses: NVIDIA/[email protected].15
       env:
         AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
         AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}