fix(deps): update dependency decap-cms-app to v3.9.0

Author: renovate[bot]

package.json

@@ -80,7 +80,7 @@
     "cors": "2.8.5",
     "cypress-axe": "1.7.0",
     "dayjs": "1.11.19",
-    "decap-cms-app": "3.0.12",
+    "decap-cms-app": "3.9.0",
     "dedent": "1.7.0",
     "express": "4.21.2",
     "fast-deep-equal": "3.1.3",

web/package.json

@@ -60,7 +60,7 @@
     "broken-link-checker": "0.7.8",
     "cypress-axe": "1.7.0",
     "dayjs": "1.11.19",
-    "decap-cms-app": "3.0.12",
+    "decap-cms-app": "3.9.0",
     "fast-deep-equal": "3.1.3",
     "focus-trap-react": "10.2.3",
     "gray-matter": "4.0.3",