Fix deprecations from Doctrine Annotations+Cache

Author: derrabus

composer.json

@@ -21,7 +21,6 @@
     },
     "require-dev": {
         "doctrine/annotations": "^1.10.4",
-        "doctrine/cache": "~1.0",
         "phpdocumentor/reflection-docblock": "^3.2|^4.0|^5.0",
         "symfony/cache": "^3.4|^4.0|^5.0",
         "symfony/config": "^3.4|^4.0|^5.0",
@@ -49,8 +48,7 @@
         "symfony/config": "For using the XML mapping loader.",
         "symfony/property-access": "For using the ObjectNormalizer.",
         "symfony/http-foundation": "For using a MIME type guesser within the DataUriNormalizer.",
-        "doctrine/annotations": "For using the annotation mapping. You will also need doctrine/cache.",
-        "doctrine/cache": "For using the default cached annotation reader and metadata cache."
+        "doctrine/annotations": "For using the annotation mapping."
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\Serializer\\": "" },