Release 8.5.9

[sosnovsky]

This PR updates version to 8.5.9 and adds changelog + sticks with web-ext v7, as v8 doesn't support node16 used on our deploy infrastructure.

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Tests (delete all except exactly one):

• Does not need tests (refactor only, docs or internal changes)

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• is documented clearly and usefully, or doesn't need documentation

[sosnovsky]

Why is snyk failing? I don't have access to snyk (Just requested access though)

I don't have access to it too, and not sure which change can cause snyk check failure.

@DenBond7 do you have access to Snyk dashboard?

[martgil]

I check it too on my account and I do not have access to Snyk from this repo.

[DenBond7]

@DenBond7 do you have access to Snyk dashboard?

@sosnovsky I've checked. I have no access. Please ask @tomholub for help.

[sosnovsky]

@ioanmo226 looks like snyk issue was caused by web-ext downgrade, I reverted it to v8 and snyk check has passed

[sosnovsky]

For web-ext, is it fine to push v8 to master?

Yes, it's used only when creating new firefox releases, so pushing to master doesn't affect any functionality.