Update dependency webextension-polyfill to ^0.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
webextension-polyfill	dependencies	minor	^0.5.0 -> ^0.6.0

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Release Notes

mozilla/webextension-polyfill

### [`v0.6.0`](https://togithub.com/mozilla/webextension-polyfill/releases/0.6.0) [Compare Source](https://togithub.com/mozilla/webextension-polyfill/compare/0.5.0...0.6.0) #### Bug Fixes - fix: Added missing chrome privacy api settings ([#​205](https://togithub.com/mozilla/webextension-polyfill/issues/205)) - fix: Make the polyfill dist file loadable as an ES6 module ([#​202](https://togithub.com/mozilla/webextension-polyfill/issues/202)) #### Docs - README.md: Added a new ["Basic Setup with ES6 module loader"](https://togithub.com/mozilla/webextension-polyfill#basic-setup-with-es6-module-loader) section ([#​216](https://togithub.com/mozilla/webextension-polyfill/issues/216)) See [all changes for 0.6.0](https://togithub.com/mozilla/webextension-polyfill/compare/0.5.0...0.6.0) -

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