#6185 Upgrade avajs to v7

[ioanatflowcrypt]

This PR upgraded avajs to v7

close #6185 // if this PR closes an issue

---

Tests (delete all except exactly one):

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

---

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

[ioanatflowcrypt]

@sosnovsky Could you tell me what triggers snyk failure?
I don't have acccess to snyk and can't see details.

[sosnovsky]

Hi @ioanatflowcrypt, error description on Snyk says Failed to parse package.json or package-lock.json as valid JSON, as there are some unresolved merge conflicts in package-lock.json - https://github.com/FlowCrypt/flowcrypt-browser/blob/6185-upgrade-avajs-to-v7/package-lock.json#L747