Release psdk version 0.2021.3

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

debian/changelog

+psdk (0.2021.3) apertis; urgency=medium
+
+  * Add debian/apertis/copyright
+  * Add debian/apertis/lintian
+  * Override lintian tag no-manual-page
+  * Switch deprecated extra priority to optional
+  * Switch to debhelper-compat (= 13)
+
+ -- Dylan Aïssi <dylan.aissi@collabora.com>  Mon, 23 Jan 2023 12:06:16 +0100
+
 psdk (0.2021.2) apertis; urgency=medium
 
   * Switch to single partition