Bump css-vars-ponyfill from 2.4.5 to 2.4.6

Bumps [css-vars-ponyfill](https://github.com/jhildenbiddle/css-vars-ponyfill) from 2.4.5 to 2.4.6.
- [Release notes](https://github.com/jhildenbiddle/css-vars-ponyfill/releases)
- [Changelog](https://github.com/jhildenbiddle/css-vars-ponyfill/blob/master/CHANGELOG.md)
- [Commits](jhildenbiddle/css-vars-ponyfill@v2.4.5...v2.4.6)

---
updated-dependencies:
- dependency-name: css-vars-ponyfill
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -48,7 +48,7 @@
     "camelcase": "^6.2.0",
     "clipboard": "^2.0.8",
     "core-js": "^3.8.3",
-    "css-vars-ponyfill": "^2.4.5",
+    "css-vars-ponyfill": "^2.4.6",
     "davclient.js": "git+https://github.com/owncloud/davclient.js.git#0.2.1",
     "debounce": "^1.2.1",
     "dompurify": "^2.2.9",