chore(deps): bump geckodriver from 1.16.2 to 1.21.0

Bumps [geckodriver](https://github.com/vladikoff/node-geckodriver) from 1.16.2 to 1.21.0.
- [Release notes](https://github.com/vladikoff/node-geckodriver/releases)
- [Commits](webdriverio-community/node-geckodriver@v1.16.2...v1.21.0)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -31,7 +31,7 @@
     },
     "dependencies": {
         "galenframework": "2.4.4",
-        "geckodriver": "1.16.2",
+        "geckodriver": "1.21.0",
         "gulp-util": "^3.0",
         "snyk": "^1.207.2",
         "through2": "^3.0.1"