btrfs-progs: update CHANGES for 6.14

Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

CHANGES

@@ -1,3 +1,19 @@
+btrfs-progs-6.13 (2025-03-26)
+-----------------------------
+   * mkfs:
+      * allow --sectorsize to be 2K for testing purposes of subpage mode (needs
+        the same block size supported by kernel)
+      * fix false error when no compression is requested and lzo is not compiled in
+   * convert: support 2K block size in the source filesystem
+   * defrag: new parameter -L/--level to specify compression levels (kernel 6.15),
+     also supports the realtime levels
+   * subvol delete: show names of recursively deleted child subvolumes
+   * qgroup show: use sysfs to detect up to date consistency status
+   * zoned mode: support zone capacity tracking
+   * other:
+      * CI new and updated workflows
+      * documentation updates
+
 btrfs-progs-6.13 (2025-02-15)
 -----------------------------
    * mkfs: