fix: update sinon fake timers broken link (#4879)

* fix: update broken link for Colorable

Update broken link for Colorable in Color contrast section

* fix: update broken sinon fake timers broken link

content/docs/testing-environments.md

@@ -47,7 +47,7 @@ On Node.js, runners like Jest [support mocking modules](https://jestjs.io/docs/e
 
 ### Mocking timers {#mocking-timers}
 
-Components might be using time-based functions like `setTimeout`, `setInterval`, or `Date.now`. In testing environments, it can be helpful to mock these functions out with replacements that let you manually "advance" time. This is great for making sure your tests run fast! Tests that are dependent on timers would still resolve in order, but quicker [<small>(example)</small>](/docs/testing-recipes.html#timers). Most frameworks, including [Jest](https://jestjs.io/docs/en/timer-mocks), [sinon](https://sinonjs.org/releases/v7.3.2/fake-timers/) and [lolex](https://github.com/sinonjs/lolex), let you mock timers in your tests.
+Components might be using time-based functions like `setTimeout`, `setInterval`, or `Date.now`. In testing environments, it can be helpful to mock these functions out with replacements that let you manually "advance" time. This is great for making sure your tests run fast! Tests that are dependent on timers would still resolve in order, but quicker [<small>(example)</small>](/docs/testing-recipes.html#timers). Most frameworks, including [Jest](https://jestjs.io/docs/en/timer-mocks), [sinon](https://sinonjs.org/releases/latest/fake-timers) and [lolex](https://github.com/sinonjs/lolex), let you mock timers in your tests.
 
 Sometimes, you may not want to mock timers. For example, maybe you're testing an animation, or interacting with an endpoint that's sensitive to timing (like an API rate limiter). Libraries with timer mocks let you enable and disable them on a per test/suite basis, so you can explicitly choose how these tests would run.