Remove default_backend parameter from cryptography calls.

[iliakur]

What does this PR do?

Remove parameter that will be soon deprecated by cryptography.

Motivation

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached
• If the PR doesn't need to be tested during QA, please add a qa/skip-qa label.

[codecov]

Codecov Report

Merging #13333 (b436c57) into master (3aa3c95) will increase coverage by 0.26%.
The diff coverage is 83.33%.

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zk	86.23% <ø> (+0.91%)	⬆️

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[iliakur]

Gonna merge, the only thing that's failing is the vault benchmarks which are fixed in master.