doc: reset PendingReleaseNotes.md

reset PendingReleaseNotes.md for next release

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

PendingReleaseNotes.md

@@ -1,17 +1,9 @@
-# v3.12 Pending Release Notes
+# v3.13 Pending Release Notes
 
 ## Breaking Changes
 
 ## Features
 
-- deploy: podSecurityContexts can be configured for ceph-csi-cephfs chart in [PR](https://github.com/ceph/ceph-csi/pull/4664).
-- deploy: podSecurityContexts can be configured for ceph-csi-rbd chart in [PR](https://github.com/ceph/ceph-csi/pull/4668)
-- deploy: instanceID can be optionally configured for ceph-csi charts in [PR](https://github.com/ceph/ceph-csi/pull/4666)
-- rbd: add support for flattenMode option for replication in [PR](https://github.com/ceph/ceph-csi/pull/4678)
-- cephfs: support omap data store in radosnamespace via cli argument in [PR](https://github.com/ceph/ceph-csi/pull/4652)
-- deploy: radosNamespaceCephFS can be configured for ceph-csi-cephfs chart in [PR](https://github.com/ceph/ceph-csi/pull/4652)
-- build: update ceph release to squid in [PR](https://github.com/ceph/ceph-csi/pull/4735)
-- build: CentOS Stream 9 is used as OS in the container-images [PR](https://github.com/ceph/ceph-csi/pull/4735)
 - util: a log message "Slow GRPC" is now emitted when
   CSI GRPC call outlives its deadline [PR](https://github.com/ceph/ceph-csi/pull/4847)