Update test mocks and docs

docs/Configuration.md

@@ -143,7 +143,7 @@ If `true`, Metro will use a stable mapping from files to transformer workers, so
 
 Type: `number`
 
-The number of workers to use for parallel processing in Metro. Defaults to approximately half of the number of cores available on the machine, as reported by [`os.cpus()`](https://nodejs.org/api/os.html#oscpus).
+The number of workers to use for parallel processing in Metro. Defaults to approximately half of the number of cores available on the machine, as reported by [`os.availableParallelism()`](https://nodejs.org/api/os.html#availableparallelism).
 
 :::note
 1. Values exceeding the number of available cores have no effect.

packages/metro/src/lib/__tests__/getMaxWorkers-test.js

@@ -20,17 +20,17 @@ test('calculates the number of max workers', () => {
   /* $FlowFixMe(>=0.99.0 site=react_native_fb) This comment suppresses an error
    * found when Flow v0.99 was deployed. To see the error, delete this comment
    * and run Flow. */
-  os.cpus.mockReturnValue({length: 1});
+  os.availableParallelism.mockReturnValue({length: 1});
   expect(getMaxWorkers()).toBe(1);
   /* $FlowFixMe(>=0.99.0 site=react_native_fb) This comment suppresses an error
    * found when Flow v0.99 was deployed. To see the error, delete this comment
    * and run Flow. */
-  os.cpus.mockReturnValue({length: 8});
+  os.availableParallelism.mockReturnValue({length: 8});
   expect(getMaxWorkers()).toBe(6);
   /* $FlowFixMe(>=0.99.0 site=react_native_fb) This comment suppresses an error
    * found when Flow v0.99 was deployed. To see the error, delete this comment
    * and run Flow. */
-  os.cpus.mockReturnValue({length: 24});
+  os.availableParallelism.mockReturnValue({length: 24});
   expect(getMaxWorkers()).toBe(14);
   expect(getMaxWorkers(5)).toBe(5);
 });