Bump web-ext from 4.3.0 to 5.0.0

Bumps [web-ext](https://github.com/mozilla/web-ext) from 4.3.0 to 5.0.0.
- [Release notes](https://github.com/mozilla/web-ext/releases)
- [Commits](mozilla/web-ext@4.3.0...5.0.0)

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

package.json

@@ -2,7 +2,7 @@
     "author": "Sebastian Blask",
     "devDependencies": {
         "eslint": "7.5.x",
-        "web-ext": "4.3.x"
+        "web-ext": "5.0.x"
     },
     "license": "MIT",
     "name": "opentabsnexttocurrent",