[TASK] Only load extensions compatible with TYPO3 v8 or later

In order to keep the the extension list in the database small,
the repository data is limited to TYPO3 v8 or later.

Resolves: #88814
Releases: master
Change-Id: I1632e269c748541b7a6b8eca763d2938c29c0509
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61335
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>

typo3/sysext/extensionmanager/Classes/Utility/Importer/ExtensionListUtility.php

@@ -176,9 +176,9 @@ public function __construct()
         // This effectively reduces the number of extensions imported into this TYPO3 installation
         // by more than 70%. As long as the extensions.xml from TER includes these files, we need to "hack" this
         // within TYPO3 Core.
-        // For TYPO3 v10.0, this date could be set to 2017-04-04 (8 LTS release).
+        // For TYPO3 v11.0, this date could be set to 2018-10-02 (v9 LTS release).
         // Also see https://decisions.typo3.org/t/reduce-size-of-extension-manager-db-table/329/
-        $this->minimumDateToImport = strtotime('2015-11-10T00:00:00+00:00');
+        $this->minimumDateToImport = strtotime('2017-04-04T00:00:00+00:00');
     }
 
     /**