Attempt at bumping psalm version

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

vendor-bin/psalm/composer.json

@@ -1,10 +1,10 @@
 {
     "require": {
-        "vimeo/psalm": "^4.18"
+        "vimeo/psalm": "^4.30"
     },
     "config": {
         "platform": {
-            "php": "7.4"
+            "php": "8.0"
         },
         "allow-plugins": {
             "composer/package-versions-deprecated": true