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

symfony.lock

@@ -443,13 +443,23 @@
         "version": "v4.0.3"
     },
     "symfony/framework-bundle": {
-        "version": "3.3",
+        "version": "6.4",
         "recipe": {
             "repo": "github.com/symfony/recipes",
-            "branch": "master",
-            "version": "3.3",
-            "ref": "137a14eeb6b3f5370e7147af8aff6518504f50c7"
-        }
+            "branch": "main",
+            "version": "6.4",
+            "ref": "a91c965766ad3ff2ae15981801643330eb42b6a5"
+        },
+        "files": [
+            "config/packages/cache.yaml",
+            "config/packages/framework.yaml",
+            "config/preload.php",
+            "config/routes/framework.yaml",
+            "config/services.yaml",
+            "public/index.php",
+            "src/Controller/.gitignore",
+            "src/Kernel.php"
+        ]
     },
     "symfony/http-client": {
         "version": "v4.4.5"