overrides: unpin kernel-6.3.12-200.fc38

unpin the kernel in testing-devel so we can ship our prod streams
with the latest packages in the next release cycle. In the
community meeting, we decided to pin the kernel only on
`ppc64le` for this cycle.

See: coreos/fedora-coreos-tracker#1489 (comment)

manifest-lock.overrides.yaml

@@ -9,26 +9,6 @@
 # for FCOS-specific packages (ignition, afterburn, etc.).
 
 packages:
-  kernel:
-    evr: 6.3.12-200.fc38
-    metadata:
-      reason: https://github.com/coreos/fedora-coreos-tracker/issues/1489
-      type: pin
-  kernel-core:
-    evr: 6.3.12-200.fc38
-    metadata:
-      reason: https://github.com/coreos/fedora-coreos-tracker/issues/1489
-      type: pin
-  kernel-modules:
-    evr: 6.3.12-200.fc38
-    metadata:
-      reason: https://github.com/coreos/fedora-coreos-tracker/issues/1489
-      type: pin
-  kernel-modules-core:
-    evr: 6.3.12-200.fc38
-    metadata:
-      reason: https://github.com/coreos/fedora-coreos-tracker/issues/1489
-      type: pin
   moby-engine:
     evr: 20.10.23-1.fc38
     metadata: