PLANET-7389 Add PHP8.3 tests job (#2341)

This is to prepare for the upgrade. This commit also removes 'doctrine/instantiator' from composer file which is no longer needed.

.circleci/config.yml

@@ -77,6 +77,16 @@ jobs:
         auth:
           <<: *docker_auth
 
+  php83-tests:
+    <<: *php_job
+    docker:
+      - image: greenpeaceinternational/p4-unit-tests:php8.3
+        auth:
+          <<: *docker_auth
+      - image: cimg/mysql:5.7
+        auth:
+          <<: *docker_auth
+
   frontend-tests:
     docker:
       - image: greenpeaceinternational/p4-unit-tests:node16.19.0
@@ -366,6 +376,8 @@ workflows:
     jobs:
       - php81-tests:
           <<: *on_pr
+      - php83-tests:
+          <<: *on_pr
       - frontend-tests:
           <<: *on_pr
       - commitlint:

composer.json

@@ -39,7 +39,6 @@
     "laminas/laminas-dom": "^2.12",
     "phpunit/phpunit": "^7.5||^9.5",
     "yoast/phpunit-polyfills": "^1.1.0",
-    "doctrine/instantiator": "^1.5.0",
     "timber/timber": "1.24.0"
   },
   "scripts": {