Use tagged version of ProtonMail/go-crypto in go.mod

[paulcacheux]

Description of the Change

This change convert the usage of github.com/ProtonMail/go-crypto from a commit based require to a tag one. The underlying commit is currently exactly the same one.

When we started using ProtonMail/go-crypto the project did not use tag for releases which forced us to use the commit in the go.mod file. Now that they are tagging releases, we can move on to the actual tag.

Checklist

• [ ] unit-test added (if change is algorithm)
• [ ] functional test added/updated (if change is functional)
• [ ] man page updated (if applicable)
• [ ] bash completion updated (if applicable)
• [ ] documentation updated
• [x] author name in AUTHORS

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.78%. Comparing base (50eaf6c) to head (8ab8fe8). Report is 17 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1253 +/- ## ======================================= Coverage 74.78% 74.78% ======================================= Files 143 143 Lines 16200 16200 ======================================= Hits 12115 12115 Misses 3148 3148 Partials 937 937 ```

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[paulcacheux]

@neolynx would you mind taking a look ?