What?

• Fixes the import path for testutils/grpcservice:
  • Note: "internal" import is allowed because the module name also "belongs" to k6
• Removes the call to rand.Seed, which is no longer needed since Go 1.20, I think.

Why?

To keep the examples, and dependant services, healthy.

Checklist

• I have performed a self-review of my code.
• I have commented on my code, particularly in hard-to-understand areas.
• I have added tests for my changes.
• I have run linter and tests locally (make check) and all pass.

Checklist: Documentation (only for k6 maintainers and if relevant)

Please do not merge this PR until the following items are filled out.

• I have added the correct milestone and labels to the PR.
• I have updated the release notes: link
• I have updated or added an issue to the k6-documentation: grafana/k6-docs#NUMBER if applicable
• I have updated or added an issue to the TypeScript definitions: grafana/k6-DefinitelyTyped#NUMBER if applicable

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