Update to 2.9.3

Upstream changes:
Highlights

    MDL-42639 - Web service core_user_get_users_by_field should return username or idnumber to all managers
    MDL-48861 - Assignment: "Need grading" filter is not working properly within grading overview
    MDL-51552 - "Single View" bulk insert for empty grades no longer overwrites non-empty grades
    MDL-51083 - Fixed undesired browser password autofilling in several forms (majority of forms were fixed in MDL-45772 in previous release)
    MDL-36606 - AJAX Grader report now works correctly when uneditable cells are present

Functional changes

    MDL-49545 - Teachers without capability to change course full or short name should not be able to do it during restore as well
    MDL-50917 - Allow manager to access another user's preferences
    MDL-50811 - Forum email replies update completion tracking information
    MDL-51834 - Lock custom profile fields that are set to by synchronised with various auth plugins
    MDL-44707 - Copy embedded files in HTML block when duplicating block (mostly affects adding HTML block with files to default Dashboard)
    MDL-51467 - Changing course start date when resetting course now correctly adjusts Date Restrictions
    MDL-43594 - Assignment: Resetting course start date now updates calendar events respectfully

UI changes

    MDL-40710 - Better visualization of badges backpack icon
    MDL-51290 - Make adding a photo to a profile more obvious
    MDL-50207 - Fixed activity results block CSS not to overwrite table caption and work correctly with RTL

Security issues

A number of security related issues were resolved. Details of these issues will be released after a period of approximately one week to allow system administrators to safely update to the latest version.

Fixes and improvements

    MDL-51514 - Performance improvement in one of regrading queries on MySQL
    MDL-51498 - Improve performance for regrading gradebook
    MDL-50805 - Performance improvement in cron Messaging Cleanup Task
    MDL-50790 - Fixed problem with removing content of Reply to email feature in gmail
    MDL-26429 - Added missing criteria icons to completion report
    MDL-51190 - Fixed MS Edge locking up when viewing embedded PDF
    MDL-46710 - LTI module correctly tracks completion when opened in a new window
    MDL-46497 - Atto: clicking RTL button and then LTR button should not add additional HTML tags
    MDL-49032 - RFC2445_WSP defined incorrectly for Bennu iCal.
    MDL-50892 - Fixed errors appearing when resource or activity was named '0' (zero)
    MDL-51390 - Badges: fixed connection to external backpack
    MDL-50079 - Atto: Fixed bug when user was unable to select "open in new window" when linking to the file from repository
    MDL-48881 - Fixed bug with lesson not always showing student attempts

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