Bump css-vars-ponyfill from 2.4.2 to 2.4.3

Bumps [css-vars-ponyfill](https://github.com/jhildenbiddle/css-vars-ponyfill) from 2.4.2 to 2.4.3.
- [Release notes](https://github.com/jhildenbiddle/css-vars-ponyfill/releases)
- [Changelog](https://github.com/jhildenbiddle/css-vars-ponyfill/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jhildenbiddle/css-vars-ponyfill/compare/v2.4.2...v2.4.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: npmbuildbot-nextcloud[bot] <npmbuildbot-nextcloud[bot]@users.noreply.github.com>

package-lock.json

@@ -3908,9 +3908,9 @@
       }
     },
     "css-vars-ponyfill": {
-      "version": "2.4.2",
-      "resolved": "https://registry.npmjs.org/css-vars-ponyfill/-/css-vars-ponyfill-2.4.2.tgz",
-      "integrity": "sha512-kp8Ufs7jJDoaSym1hw/deawtakLJJTAQMB4ZgkdyOwCTJHqEClbpXI910ovQU4Guxt37EcdRiqppG9ihFyCjPQ=="
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/css-vars-ponyfill/-/css-vars-ponyfill-2.4.3.tgz",
+      "integrity": "sha512-PBfIwjSu27s8kebu8taEYFM8ehVr8o2Qw4H4nSlJzHAJgcduAqxz4oPmYTJuzgauOKaWII9SHWStQ965fxsdZA=="
     },
     "cssesc": {
       "version": "3.0.0",

package.json

@@ -48,7 +48,7 @@
     "camelcase": "^6.2.0",
     "clipboard": "^2.0.6",
     "core-js": "^3.8.3",
-    "css-vars-ponyfill": "^2.4.2",
+    "css-vars-ponyfill": "^2.4.3",
     "davclient.js": "git+https://github.com/owncloud/davclient.js.git#0.2.1",
     "debounce": "^1.2.0",
     "dompurify": "^2.2.6",