Update github.com/grafana/xk6-webcrypto to v0.3.0

[olegbespalov]

What?

This brings the latest updates of webcrypto including changes from release https://github.com/grafana/xk6-webcrypto/releases/tag/v0.3.0

Why?

We'd like to include the updates in the upcoming release.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.24%. Comparing base (eec9105) to head (0e8ca27).

❗ Current head 0e8ca27 differs from pull request most recent head c9bf94b. Consider uploading reports for the commit c9bf94b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3713      +/-   ##
==========================================
- Coverage   73.26%   73.24%   -0.03%     
==========================================
  Files         276      276              
  Lines       20420    20420              
==========================================
- Hits        14961    14956       -5     
- Misses       4504     4507       +3     
- Partials      955      957       +2     

Flag	Coverage Δ
ubuntu	73.24% <ø> (-0.03%)	⬇️

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[mstoykov]

Nice 450kb saved:

55556   k6-master
55108   k6-webcrypto

[olegbespalov]

Closing in favor of #3714