fix(deps): update dependency webextension-polyfill to ^0.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webextension-polyfill	^0.8.0 -> ^0.12.0

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Release Notes

mozilla/webextension-polyfill (webextension-polyfill)

### [`v0.12.0`](https://togithub.com/mozilla/webextension-polyfill/releases/tag/0.12.0) [Compare Source](https://togithub.com/mozilla/webextension-polyfill/compare/0.11.0...0.12.0) ##### Bug Fixes - Removed unnecessary webpack and webpack-cli npm packages from webextension-polyfill npm package dependencies ([#​614](https://togithub.com/mozilla/webextension-polyfill/issues/614)) ([https://github.com/mozilla/webextension-polyfill/issues/604](https://togithub.com/mozilla/webextension-polyfill/issues/604)) See [all changes for 0.12.0](https://togithub.com/mozilla/webextension-polyfill/compare/0.11.0...0.12.0) - https://unpkg.com/webextension-polyfill@0.12.0/dist/ ### [`v0.11.0`](https://togithub.com/mozilla/webextension-polyfill/releases/tag/0.11.0) [Compare Source](https://togithub.com/mozilla/webextension-polyfill/compare/0.10.0...0.11.0) ##### Bug Fixes - Fix no-op check to work with Safari and support of old browsers ([#​582](https://togithub.com/mozilla/webextension-polyfill/issues/582)) ([https://github.com/mozilla/webextension-polyfill/issues/364](https://togithub.com/mozilla/webextension-polyfill/issues/364)) See [all changes for 0.11.0](https://togithub.com/mozilla/webextension-polyfill/compare/0.10.0...0.11.0) - https://unpkg.com/webextension-polyfill@0.11.0/dist/ ### [`v0.10.0`](https://togithub.com/mozilla/webextension-polyfill/releases/tag/0.10.0) [Compare Source](https://togithub.com/mozilla/webextension-polyfill/compare/0.9.0...0.10.0) ##### Bug Fixes - Removed obsolete deprecation warning logged on sendResponse callback calls ([#​386](https://togithub.com/mozilla/webextension-polyfill/issues/386)) See [all changes for 0.10.0](https://togithub.com/mozilla/webextension-polyfill/compare/0.9.0...0.10.0) - https://unpkg.com/webextension-polyfill@0.10.0/dist/ ### [`v0.9.0`](https://togithub.com/mozilla/webextension-polyfill/releases/tag/0.9.0) [Compare Source](https://togithub.com/mozilla/webextension-polyfill/compare/0.8.0...0.9.0) ##### Bug Fixes - enable webextension-polyfill usage via webpack ProvidePlugin ([#​351](https://togithub.com/mozilla/webextension-polyfill/issues/351)) See [all changes for 0.9.0](https://togithub.com/mozilla/webextension-polyfill/compare/0.8.0...0.9.0) - https://unpkg.com/webextension-polyfill@0.9.0/dist/

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