Git commits in Moodle 3.7.7 by Paul Holden

commit f77412b119ab7a4860125f05dcf08b01e2325c64
Author: Paul Holden <paulh@moodle.com>
Date:   Fri, 01 May 2020 16:00:41 +0800
Tag:    v3.7.7

MDL-68084 blocks: check capability before getting content.

commit 536c771a3f576b1eee7d5d03d0164d1c0e067f26
Author: Paul Holden <paulh@moodle.com>
Date:   Wed, 19 Feb 2020 07:28:42 +0800
Tag:    v3.7.7

MDL-66917 admin: validate uploaded plugin version.