Update dependency classnames to v2.3.1 (#43090)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

packages/grafana-ui/package.json

@@ -47,7 +47,7 @@
     "@sentry/browser": "6.15.0",
     "ansicolor": "1.1.95",
     "calculate-size": "1.1.1",
-    "classnames": "2.2.6",
+    "classnames": "2.3.1",
     "clipboard": "2.0.4",
     "core-js": "3.10.0",
     "d3": "5.15.0",
@@ -118,7 +118,7 @@
     "@testing-library/react": "12.1.2",
     "@testing-library/react-hooks": "7.0.2",
     "@testing-library/user-event": "13.5.0",
-    "@types/classnames": "2.2.7",
+    "@types/classnames": "2.3.0",
     "@types/clipboard": "2.0.1",
     "@types/common-tags": "^1.8.0",
     "@types/d3": "7.1.0",