Update dependencies of tool-cache to fix npm audit (#795)

* Update dependencies to resolve security issue

* run npm audit fix in `actions/github`

* update jest as well to newest version

package.json

@@ -44,7 +44,7 @@
     "@octokit/plugin-rest-endpoint-methods": "^5.1.1"
   },
   "devDependencies": {
-    "jest": "^25.1.0",
-    "proxy": "^1.0.1"
+    "jest": "^26.6.3",
+    "proxy": "^1.0.2"
   }
 }