feat: upgrade xk6-dashboard to v0.7.5

[szkiba]

What?

Upgrade xk6-dashboard to v0.7.5

Why?

Configuration customization from JavaScript code has been removed

Until now, the dashboard configuration could be customized with a JavaScript code. Supporting this feature after switching the JavaScript interpreter (goja to sobek) causes serious difficulties. Since this feature is rarely used, it is easier to drop it than to support it.

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.94%. Comparing base (c682fa2) to head (226bff7).

❗ Current head 226bff7 differs from pull request most recent head ce3b963

Please upload reports for the commit ce3b963 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3821   +/-   ##
=======================================
  Coverage   71.93%   71.94%           
=======================================
  Files         291      291           
  Lines       21277    21277           
=======================================
+ Hits        15305    15307    +2     
+ Misses       4913     4912    -1     
+ Partials     1059     1058    -1     

Flag	Coverage Δ
ubuntu	71.87% <ø> (+<0.01%)	⬆️
windows	71.78% <ø> (+<0.01%)	⬆️

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