fix[contracts]: Fix a bug in contracts package json that removed artifacts (#810)

* fix: bug in contracts package json

* chore: add changeset

.changeset/warm-zoos-speak.md

+---
+'@eth-optimism/contracts': patch
+---
+
+Fixed a bug in package json that stopped artifacts from being published

packages/contracts/package.json

@@ -6,8 +6,8 @@
     "dist/**/*.js",
     "dist/types/*.ts",
     "dist/types-ovm/*.ts",
-    "artifacts/contracts/*.json",
-    "artifacts-ovm/contracts/*.json",
+    "artifacts/contracts/**/*.json",
+    "artifacts-ovm/contracts/**/*.json",
     "OVM",
     "iOVM",
     "libraries",