Bump css-vars-ponyfill from 1.16.4 to 1.17.0

Bumps [css-vars-ponyfill](https://github.com/jhildenbiddle/css-vars-ponyfill) from 1.16.4 to 1.17.0.
- [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/v1.16.4...v1.17.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>
Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

package-lock.json

@@ -2305,9 +2305,9 @@
       }
     },
     "css-vars-ponyfill": {
-      "version": "1.16.4",
-      "resolved": "https://registry.npmjs.org/css-vars-ponyfill/-/css-vars-ponyfill-1.16.4.tgz",
-      "integrity": "sha512-5B5SsjF/7kQPi2HvHNZAmh+LHLeGEkQO3Nqk/EoJyzZ1YOpzpX87FS4Y+s49XnTUlw9RAzgHenzVZF/I1olZcA=="
+      "version": "1.17.0",
+      "resolved": "https://registry.npmjs.org/css-vars-ponyfill/-/css-vars-ponyfill-1.17.0.tgz",
+      "integrity": "sha512-95Ytuv1y/MB3lzzD02msFLXVzQgmclOcEf7+sIzmYvmPPCJ5xqa0lzeoscfs4auCM31Sh13IroQRVdg7++64tw=="
     },
     "cssesc": {
       "version": "0.1.0",

package.json

@@ -28,7 +28,7 @@
     "blueimp-md5": "^2.10.0",
     "bootstrap": "^3.4.1",
     "clipboard": "^2.0.4",
-    "css-vars-ponyfill": "^1.16.4",
+    "css-vars-ponyfill": "^1.17.0",
     "davclient.js": "git+https://github.com/owncloud/davclient.js.git#0.1.3",
     "dompurify": "^1.0.10",
     "handlebars": "^4.1.0",