Revert "chore: release 3.1.0 (#500)"

This reverts commit a339c97.

Author: abbesBenayache

release-please-config.json

@@ -33,10 +33,7 @@
     "packages/subgraph": {
       "release-type": "node",
       "changelog-path": "CHANGELOG.md",
-      "include-v-in-tag": true,
-      "prerelease": true,
-      "prerelease-type": "beta",
-      "versioning": "prerelease"
+      "include-v-in-tag": true
     },
     "packages/smart-contract": {
       "release-type": "node",