Linux 5.18 compat: META

Update the META file to reflect compatibility with the 5.18 kernel.

Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Tony Hutter <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #13527

Author: behlendorf

META

@@ -6,5 +6,5 @@ Release:       1
 Release-Tags:  relext
 License:       CDDL
 Author:        OpenZFS
-Linux-Maximum: 5.17
+Linux-Maximum: 5.18
 Linux-Minimum: 3.10