Increment version to 2.12.0.0 (#1676)

Signed-off-by: opensearch-ci-bot <[email protected]>
Co-authored-by: opensearch-ci-bot <[email protected]>

Author: opensearch-trigger-bot[bot]

package.json

@@ -71,4 +71,4 @@
     "semver": "^7.5.2",
     "@cypress/request": "^3.0.0"
   }
-}
+}