fixup! test(a3p-integration): update to agoric-upgrade-18

fix package.json

Author: mujahidkay

a3p-integration/proposals/n:upgrade-next/package.json

@@ -1,6 +1,12 @@
 {
   "agoricProposal": {
-    "type": "/agoric.swingset.CoreEvalProposal",
+    "releaseNotes": false,
+    "sdkImageTag": "unreleased",
+    "planName": "UNRELEASED_A3P_INTEGRATION",
+    "upgradeInfo": {
+      "coreProposals": []
+    },
+    "type": "Software Upgrade Proposal",
     "sdk-generate": [
       "testing/replace-feeDistributor-short.js replaceFeeDistributor",
       "testing/add-USD-LEMONS.js addUsdLemons",