Update actions/delete-package-versions to v5.0.0 (#135)

v4.1.1 runs on the deprecated node16 runtime. v5.0.0 moves to node20.
Inputs are unchanged between the two versions, so this is a drop-in bump.

Author: SeanTAllen

.github/workflows/release-a-library-update.yml

@@ -47,8 +47,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Prune
-        # v4.1.1
-        uses: actions/delete-package-versions@0d39a63126868f5eefaa47169615edd3c0f61e20
+        # v5.0.0
+        uses: actions/delete-package-versions@e5bc658cc4c965c472efe991f8beea3981499c55
         with:
           package-name: 'shared-docker-ci-release-a-library'
           package-type: 'container'