chore(deps): update dependency karma to v6.3.8

This MR contains the following updates:

Package	Type	Update	Change
karma (source)	devDependencies	patch	6.3.7 -> 6.3.8

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Release Notes

karma-runner/karma

v6.3.8

Compare Source

Bug Fixes

• reporter: warning if stack trace contains generated code invocation (4f23b14)

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