Update cryptography 3.4.x resources

[alex]

This ensures that all brew packages use the latest version in the 3.4.x series

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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[Bo98]

charm-tools might fail because it might need juju/charm-tools#611 (I can handle it in a separate PR). Rest should be good.

[alex]

Thanks! Happy to rebase when that happens.

(I'm one of the cryptography maintainers and I want to move the ecosystem to using the latest releases and getting to the latest within a version is the starting point.)

[alex]

Looks like CI timed out despite the labels (perhaps they were added after the job started?)

[alex]

Tests appear to be passing now, just timing out on some of the builders.

[BrewTestBot]

🤖 A scheduled task has triggered a merge.