Release 2.9.0 (#4526)

* added fix to work around bc break in new phpword version
* fix phpoffice deprecations
* mark unused option as deprecated
* support for DateTimeInterface and DateTimeImmutable where possible
* use TRUSTED_PROXIES setting - fixes #4533
* re-enable Kimai test in docker test build script (#4541)
* bump dependencies

src/Constants.php

@@ -17,11 +17,11 @@ class Constants
     /**
      * The current release version
      */
-    public const VERSION = '2.8.0';
+    public const VERSION = '2.9.0';
     /**
      * The current release: major * 10000 + minor * 100 + patch
      */
-    public const VERSION_ID = 20800;
+    public const VERSION_ID = 20900;
     /**
      * The software name
      */