add new overwrite input & docs

package.json

@@ -1,6 +1,6 @@
 {
   "name": "upload-artifact",
-  "version": "4.0.0",
+  "version": "4.2.0",
   "description": "Upload an Actions Artifact in a workflow run",
   "main": "dist/index.js",
   "scripts": {
@@ -29,7 +29,7 @@
   },
   "homepage": "https://github.com/actions/upload-artifact#readme",
   "dependencies": {
-    "@actions/artifact": "^2.0.0",
+    "@actions/artifact": "^2.1.0",
     "@actions/core": "^1.10.0",
     "@actions/github": "^6.0.0",
     "@actions/glob": "^0.3.0",