chore(renovate): do not bump v7 deps to v8

Renovate bot is trying to bump the v7 playground deps to v8. This change prevents it from doing that: #3603

Author: liamdebeasi

renovate.json

@@ -36,6 +36,18 @@
         "static/code/stackblitz/**/vue/package.json"
       ]
     },
+    {
+      "matchPackagePatterns": ["@ionic/"],
+      "minimumReleaseAge": "0 days",
+      "allowedVersions": "^7.0.0",
+      "groupName": "ionic",
+      "matchFileNames": [
+        "static/code/stackblitz/v7/angular/package.json",
+        "static/code/stackblitz/v7/html/package.json",
+        "static/code/stackblitz/v7/react/package.json",
+        "static/code/stackblitz/v7/vue/package.json"
+      ]
+    },
     {
       "matchPackagePatterns": ["@ionic/"],
       "minimumReleaseAge": "0 days",