update ZFS to 2.0.4

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/src/submodules/zfsonlinux b/src/submodules/zfsonlinux
index 9f5f86626620c52ad1bebf27d17cece6a28d39a0..6150fbe67f7a9485eaabbca7df9a66852cda6892 160000 (submodule)
--- a/src/submodules/zfsonlinux
+++ b/src/submodules/zfsonlinux
@@ -1 +1 @@
-Subproject commit 9f5f86626620c52ad1bebf27d17cece6a28d39a0
+Subproject commit 6150fbe67f7a9485eaabbca7df9a66852cda6892