fix(deps): update dependency @staticcms/app to v1.2.8

Author: renovate[bot]

package.json

@@ -22,7 +22,7 @@
   "dependencies": {
     "@fontsource/merriweather": "4.5.14",
     "@fontsource/montserrat": "4.5.14",
-    "@staticcms/app": "1.2.6",
+    "@staticcms/app": "1.2.8",
     "gatsby": "5.6.0",
     "gatsby-plugin-feed": "5.6.0",
     "gatsby-plugin-image": "3.6.0",