btrfs-progs: update CHANGES for 6.6

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

CHANGES

@@ -1,3 +1,32 @@
+btrfs-progs-6.6 (2023-11-03)
+----------------------------
+   * new global option --dry-run, now implemented for 'subvolume delete'
+   * fi defrag: new option --step to defragment files in steps, report progress
+   * balance: removed support for obsolete short syntax 'btrfs balance /path'
+   * mkfs: print zone count for each device in the overview
+   * check:
+      * verify inline ref ordering
+      * deprecate --clear-space-cache, moved to the 'rescue' group
+   * rescue clear-space-cache: new command moved from 'btrfs check' implementing
+     the same as option --clear-space-cache (to be deprecated and removed in the
+     future)
+   * dump-tree: output sequence number for inline refs
+   * fixes:
+     * fi resize: fallback to lowest devid when 1 does not exist, previously the
+       command would fail with "No such device"
+     * fi usage: fix "devices 0 != 1" message and broken output on multi-device
+       filesystem
+     * open files in non-blocking mode when reading fsid, this could hang when
+       trying to open fifo files or some special character devices, was observed
+       with 'prop set/get'
+   * experimental:
+      * mkfs: parametric zone size for emulated zoned mode
+   * other:
+      * cleanups refactoring
+      * new and updated tests
+      * CI updates
+      * documentation updates
+
 btrfs-progs-6.5 (2023-09-01)
 ----------------------------
    * crc32c implementation speedup (3x)