chore(deps): update dependency webextension-polyfill to ^0.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webextension-polyfill	^0.6.0 -> ^0.7.0

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Release Notes

mozilla/webextension-polyfill

### [`v0.7.0`](https://togithub.com/mozilla/webextension-polyfill/releases/0.7.0) [Compare Source](https://togithub.com/mozilla/webextension-polyfill/compare/0.6.0...0.7.0) ##### Features - Added tabs.goBack and tabs.goForward ([#​243](https://togithub.com/mozilla/webextension-polyfill/issues/243)) - Added devtools.panels.elements.createSidebarPane to metadata ([#​246](https://togithub.com/mozilla/webextension-polyfill/issues/246)) See [all changes for 0.7.0](https://togithub.com/mozilla/webextension-polyfill/compare/0.6.0...0.7.0) -

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