fix(@angular-devkit/build-angular): Downgrade Karma to 5.1.x #19336
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There's a bug in Karma 5.2.x that causes unit tests to fail when they
should not. It was supposed to be fixed in
karma-runner/karma#3565 but CI still failed,
blocking the release of Karma.
In order to mitigate this, we temporarily downgrade Karma back to 5.1.x
A side-effect of this is that coverage tests that uses karma-coverage
and exceeds the threshold will not fail, because karma-coverage requires
Karma 5.2.x. We expect this to be fixed very soon.