Bump oras-project/setup-oras from 1.2.2 to 1.2.3 (#33317)

Bumps [oras-project/setup-oras](https://github.com/oras-project/setup-oras) from 1.2.2 to 1.2.3.
- [Release notes](https://github.com/oras-project/setup-oras/releases)
- [Commits](5c0b487ce3...8d34698a59)

---
updated-dependencies:
- dependency-name: oras-project/setup-oras
  dependency-version: 1.2.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/index-update.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           ref: index
           path: index
-      - uses: oras-project/setup-oras@5c0b487ce3fe0ce3ab0d034e63669e426e294e4d
+      - uses: oras-project/setup-oras@8d34698a59f5ffe24821f0b48ab62a3de8b64b20
       - id: get-oci-index
         name: Get OCI index
         run: |