Update api-platform/core; Fail on php8 errors in CI

.gitlab-ci.yml

@@ -33,7 +33,6 @@ test-php7.4:
   <<: *test_defaults
 
 test-php8.0:
-  allow_failure: true
   stage: test
   variables:
     PHP: "php8.0"

symfony.lock

@@ -238,9 +238,6 @@
     "symfony/cache": {
         "version": "v4.4.16"
     },
-    "symfony/cache-contracts": {
-        "version": "v2.2.0"
-    },
     "symfony/config": {
         "version": "v4.4.16"
     },
@@ -257,6 +254,9 @@
             "config/bootstrap.php"
         ]
     },
+    "symfony/contracts": {
+        "version": "v1.1.10"
+    },
     "symfony/debug": {
         "version": "v4.4.16"
     },
@@ -287,9 +287,6 @@
     "symfony/event-dispatcher": {
         "version": "v4.4.16"
     },
-    "symfony/event-dispatcher-contracts": {
-        "version": "v1.1.9"
-    },
     "symfony/expression-language": {
         "version": "v4.4.16"
     },
@@ -332,9 +329,6 @@
             "src/Kernel.php"
         ]
     },
-    "symfony/http-client-contracts": {
-        "version": "v2.3.1"
-    },
     "symfony/http-foundation": {
         "version": "v4.4.16"
     },
@@ -454,15 +448,9 @@
     "symfony/serializer": {
         "version": "v4.4.16"
     },
-    "symfony/service-contracts": {
-        "version": "v2.2.0"
-    },
     "symfony/stopwatch": {
         "version": "v4.4.16"
     },
-    "symfony/translation-contracts": {
-        "version": "v2.3.0"
-    },
     "symfony/twig-bridge": {
         "version": "v4.4.16"
     },