feat: bump webcrypto to v0.2.0

[olegbespalov]

What?

This updates the webcrypto module to v0.2.0, the list of the changes is there https://github.com/grafana/xk6-webcrypto/releases/tag/v0.2.0

Why?

We'd like to bring new functionality to the webcrypto module.

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 73.52%. Comparing base (47c5bb0) to head (3a68ec7).

❗ Current head 3a68ec7 differs from pull request most recent head 26c4974. Consider uploading reports for the commit 26c4974 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3631      +/-   ##
==========================================
- Coverage   73.57%   73.52%   -0.06%     
==========================================
  Files         277      275       -2     
  Lines       20244    20239       -5     
==========================================
- Hits        14895    14880      -15     
- Misses       4401     4405       +4     
- Partials      948      954       +6     

Flag	Coverage Δ
macos	73.49% <ø> (+<0.01%)	⬆️
ubuntu	73.50% <ø> (-0.02%)	⬇️
windows	?

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[olegbespalov]

@mstoykov

 du -sh k6-new
55M     k6-new
 du -sh k6-current
54M     k6-current