[SG-38706] Dependabot: update shell-quote to a non-vulnerable version

Created by: gitstart-sourcegraph

Descriptions

• Upgrade web-ext to version 7.1.1 to have fx-runner@1.2.0 which depends on shell-quote@1.7.3 to fix dependabot creitical issue

Refs

Sourcegraph Issue GitStart Issue

Test plan

• Make sure all CI checks are passed + request confirmations from web ext team

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.