nongnu: Remove linux-6.5.
This kernel series is no longer supported upstream.
linux-libre 6.5 was removed from guix in commit 4bf4e340b74b66a0fc319aeb100fb1f948a67211.
This kernel series is no longer supported upstream.
linux-libre 6.5 was removed from guix in commit 4bf4e340b74b66a0fc319aeb100fb1f948a67211.