Bump the k6 version to v0.47.0

[codebien]

What?

Bump k6 version as defined by #3274:

Open a separate PR for bumping the k6 Go project's version.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8457c91) 72.95% compared to head (8c57271) 72.96%.

❗ Current head 8c57271 differs from pull request most recent head bba3185. Consider uploading reports for the commit bba3185 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3361   +/-   ##
=======================================
  Coverage   72.95%   72.96%           
=======================================
  Files         261      261           
  Lines       20018    20018           
=======================================
+ Hits        14605    14607    +2     
+ Misses       4486     4484    -2     
  Partials      927      927           

Flag	Coverage Δ
ubuntu	72.90% <ø> (+<0.01%)	⬆️
windows	72.80% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
lib/consts/consts.go	51.61% <ø> (ø)

... and 1 file with indirect coverage changes

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