Update META to 6.1 kernel

ZFS successfully builds against the 6.1.4 kernel.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Closes #14371

META

@@ -6,5 +6,5 @@ Release:       1
 Release-Tags:  relext
 License:       CDDL
 Author:        OpenZFS
-Linux-Maximum: 6.0
+Linux-Maximum: 6.1
 Linux-Minimum: 3.10