Replace Apollo GraphQL packages with @apollo/server ^4.0.0

Author: renovate[bot]

packages/flatbread/package.json

@@ -41,8 +41,8 @@
     "@flatbread/transformer-markdown": "workspace:*",
     "@flatbread/transformer-yaml": "workspace:*",
     "@flatbread/utils": "workspace:*",
-    "apollo-server-core": "^3.13.0",
-    "apollo-server-express": "^3.13.0",
+    "@apollo/server": "^4.0.0",
+    "@apollo/server": "^4.0.0",
     "cors": "^2.8.5",
     "express": "^5.1.0",
     "express-graphql": "^0.12.0",