Change to using sobek instead of goja

[mstoykov]

We are moving to a fork of goja under grafana org called sobek.

More info in:

• https://github.com/grafana/k6/issues/3772
• https://github.com/grafana/k6/issues/3773

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.80%. Comparing base (aaf0ca7) to head (6a7cca2). Report is 1 commits behind head on master.

Files	Patch %	Lines
mock/mock.go	92.85%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #9 +/- ## ======================================= Coverage 85.80% 85.80% ======================================= Files 4 4 Lines 162 162 ======================================= Hits 139 139 Misses 12 12 Partials 11 11 ```

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