Update setup-nightly-infra to latest version (#1741)

Fixes an issue that prevented the requested Pipelines release from
being found when setting up the environment, causing all nightly
builds since June 23rd to fail.

Author: AlanGreene

.github/workflows/nightly-build.yml

@@ -61,7 +61,7 @@ jobs:
           echo "latest_sha=${GITHUB_SHA}" >> "$GITHUB_OUTPUT"
 
       - name: Setup Tekton Nightly Infra
-        uses: tektoncd/plumbing/.github/actions/setup-nightly-infra@c4d1d3e6b8e8ac398636f75aef0faf50784a5ca7 # main
+        uses: tektoncd/plumbing/.github/actions/setup-nightly-infra@48541a866223140c82bc5c7994ad89ffabb6ff1f # main
         with:
           kubernetes_version: ${{ env.KUBERNETES_VERSION }}
           image_registry_user: ${{ env.IMAGE_REGISTRY_USER }}