Revert @actions/attest version to 2.1.0 - no new release needed

Co-authored-by: TingluoHuang <1750815+TingluoHuang@users.noreply.github.com>

packages/attest/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@actions/attest",
-  "version": "2.1.1",
+  "version": "2.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@actions/attest",
-      "version": "2.1.1",
+      "version": "2.1.0",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.11.1",

packages/attest/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/attest",
-  "version": "2.1.1",
+  "version": "2.1.0",
   "description": "Actions attestation lib",
   "keywords": [
     "github",