Update dependency webextension-polyfill to v0.12.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
webextension-polyfill	0.10.0 → 0.12.0
@types/webextension-polyfill (source)	^0.9.1 → ^0.12.5

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Release Notes

mozilla/webextension-polyfill (webextension-polyfill)

v0.12.0

Compare Source

Bug Fixes

• Removed unnecessary webpack and webpack-cli npm packages from webextension-polyfill npm package dependencies (#​614) (#​604)

See all changes for 0.12.0

• https://unpkg.com/webextension-polyfill@0.12.0/dist/

v0.11.0

Compare Source

Bug Fixes

• Fix no-op check to work with Safari and support of old browsers (#​582) (#​364)

See all changes for 0.11.0

• https://unpkg.com/webextension-polyfill@0.11.0/dist/

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