TASK: Add dependency to psr caches directly to flow as the interfaces are used in there

This changes nothing regarding installed packages as those were required by Neos.Cache anyways.

Author: mficzel

Neos.Flow/composer.json

@@ -33,6 +33,8 @@
         "psr/log": "^1.0",
         "psr/http-server-middleware": "^1.0",
         "psr/http-server-handler": "^1.0",
+        "psr/simple-cache": "^1.0",
+        "psr/cache": "~1.0",
 
         "ramsey/uuid": "^3.0 || ^4.0",