package/mono: bump to version 6.0.0.313

package/mono: bump to version 6.0.0.313

This patch bumps mono to version 6.0.0.313 and it's related dependency
monolite to version d0aa6798-834d-11e9-b38a-3b0d70487d01.

The hash of the mono license file has changed, with the following
modification:

-* mcs/nunit24: MS-PL
-

However, this modification is in the "Build Time Code" section, which
describes the license of the parts of the code used only at build
time, which we don't document in the <pkg>_LICENSE
variable. Therefore, no relevant licensing change has occured from the
point of view of <pkg>_LICENSE.

Signed-off-by: Angelo Compagnucci <angelo@amarulasolutions.com>
[Thomas: update the hash of the license file, and add a corresponding
explanation in the commit log]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>