bump to next minor version

Signed-off-by: Meredith Lancaster <malancas@github.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/attest",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "Actions attestation lib",
   "keywords": [
     "github",
@@ -55,4 +55,4 @@
       "@octokit/core": "^5.2.0"
     }
   }
-}
+}