Bump the k6 version to v0.48.0

[olegbespalov]

What?

This bumps k6 to v0.48.

Why?

We're going to release the v0.48.

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)

Part of #3382

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (856a767) 73.22% compared to head (08b92cd) 73.21%.

❗ Current head 08b92cd differs from pull request most recent head 2a8bc8b. Consider uploading reports for the commit 2a8bc8b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3486      +/-   ##
==========================================
- Coverage   73.22%   73.21%   -0.01%     
==========================================
  Files         267      267              
  Lines       20083    20083              
==========================================
- Hits        14706    14704       -2     
- Misses       4463     4465       +2     
  Partials      914      914              

Flag	Coverage Δ
ubuntu	73.14% <ø> (-0.02%)	⬇️
windows	73.07% <ø> (+<0.01%)	⬆️

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