build(deps-dev): bump prettier from 3.6.2 to 3.7.4 in /webapp

Bumps [prettier](https://github.com/prettier/prettier) from 3.6.2 to 3.7.4.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/3.6.2...3.7.4)

---
updated-dependencies:
- dependency-name: prettier
  dependency-version: 3.7.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

webapp/package.json

@@ -100,7 +100,7 @@
     "jest": "29.7",
     "jest-environment-jsdom": "^29.7.0",
     "mutation-observer": "^1.0.3",
-    "prettier": "~3.6.2",
+    "prettier": "~3.7.4",
     "sass-loader": "^10.4.1",
     "storybook-design-token": "^0.8.1",
     "storybook-vue-router": "^1.0.7",

webapp/yarn.lock

@@ -17612,10 +17612,10 @@ prettier@^1.18.2:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
   integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
 
-prettier@~3.6.2:
-  version "3.6.2"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.6.2.tgz#ccda02a1003ebbb2bfda6f83a074978f608b9393"
-  integrity sha512-I7AIg5boAr5R0FFtJ6rCfD+LFsWHp81dolrFD8S79U9tb8Az2nGrJncnMSnys+bpQJfRUzqs9hnA81OAA3hCuQ==
+prettier@~3.7.4:
+  version "3.7.4"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.7.4.tgz#d2f8335d4b1cec47e1c8098645411b0c9dff9c0f"
+  integrity sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA==
 
 pretty-bytes@^5.6.0:
   version "5.6.0"