Bump eslint from 7.20.0 to 7.21.0 (#3)

Author: dependabot[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "@iobroker/testing": "^2.4.2",
     "@types/gulp": "^4.0.8",
     "axios": "^0.21.1",
-    "eslint": "^7.20.0",
+    "eslint": "^7.21.0",
     "eslint-config-standard": "^16.0.2",
     "eslint-plugin-html": "^6.1.1",
     "eslint-plugin-import": "^2.22.1",