lockfiles: drop graduated overrides 🎓

Triggered by remove-graduated-overrides GitHub Action.

manifest-lock.overrides.yaml

@@ -8,14 +8,4 @@
 # in the `metadata.reason` key, though it's acceptable to omit a `reason`
 # for FCOS-specific packages (ignition, afterburn, etc.).
 
-packages:
-  afterburn:
-    evr: 5.6.0-1.fc40
-    metadata:
-      bodhi: https://bodhi.fedoraproject.org/updates/FEDORA-2024-f2e6b90acd
-      type: fast-track
-  afterburn-dracut:
-    evr: 5.6.0-1.fc40
-    metadata:
-      bodhi: https://bodhi.fedoraproject.org/updates/FEDORA-2024-f2e6b90acd
-      type: fast-track
+packages: {}