Bump graphql from 14.7.0 to 15.9.0 in /webapp

Bumps [graphql](https://github.com/graphql/graphql-js) from 14.7.0 to 15.9.0.
- [Release notes](https://github.com/graphql/graphql-js/releases)
- [Commits](graphql/graphql-js@v14.7.0...v15.9.0)

---
updated-dependencies:
- dependency-name: graphql
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

webapp/package.json

@@ -37,7 +37,7 @@
     "cross-env": "~7.0.3",
     "date-fns": "2.22.1",
     "express": "~4.21.1",
-    "graphql": "~14.7.0",
+    "graphql": "~15.9.0",
     "intersection-observer": "^0.12.0",
     "jsonwebtoken": "~9.0.2",
     "linkify-it": "~5.0.0",

webapp/yarn.lock

@@ -10643,17 +10643,17 @@ graphql-upload@^8.0.2:
     http-errors "^1.7.3"
     object-path "^0.11.4"
 
-"graphql@14.0.2 - 14.2.0 || ^14.3.1", graphql@^14.5.8, graphql@~14.7.0:
+"graphql@14.0.2 - 14.2.0 || ^14.3.1", graphql@^14.5.8:
   version "14.7.0"
   resolved "https://registry.yarnpkg.com/graphql/-/graphql-14.7.0.tgz#7fa79a80a69be4a31c27dda824dc04dac2035a72"
   integrity sha512-l0xWZpoPKpppFzMfvVyFmp9vLN7w/ZZJPefUicMCepfJeQ8sMcztloGYY9DfjVPo6tIUDzU5Hw3MUbIjj9AVVA==
   dependencies:
     iterall "^1.2.2"
 
-graphql@^15.3.0:
-  version "15.4.0"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.4.0.tgz#e459dea1150da5a106486ba7276518b5295a4347"
-  integrity sha512-EB3zgGchcabbsU9cFe1j+yxdzKQKAbGUWRb13DsrsMN1yyfmmIq+2+L5MqVWcDCE4V89R5AyUOi7sMOGxdsYtA==
+graphql@^15.3.0, graphql@~15.9.0:
+  version "15.9.0"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.9.0.tgz#4e8ca830cfd30b03d44d3edd9cac2b0690304b53"
+  integrity sha512-GCOQdvm7XxV1S4U4CGrsdlEN37245eC8P9zaYCMr6K1BG0IPGy5lUwmJsEOGyl1GD6HXjOtl2keCP9asRBwNvA==
 
 grid-index@^1.1.0:
   version "1.1.0"