build: update karma to v6.3.8 which contains sourcemap generated-code fix #23922
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Updates to Karma v6.3.8 which contains a sourcemap fix we landed
upstream. Previous versions of Karma printed/polluted the log output
when an error is thrown due to generated-code being part of stack
traces (due to ESBuild downleveling).
More details here:
https://gist.github.com/devversion/549d25915c2dc98a8896ba4408a1e27c.
karma-runner/karma@4f23b14
Example stack trace in a test which uses

async/await (which is downleveled)