fix: use the corresponding react-native init version (#581)

closes #580

### Summary

Uses the corresponding version of react-native init as specified by the
"--version" flag. This allows the module to be used on RNW versions
other than "latest" since latest isn't always compatible with every
version and a new version may introduce breaking changes.

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the issue with a different approach? -->

### Test plan
Actually wasn't able to test this module locally, the instructions
failed for me :( but tested `npx --yes [email protected] init
testcli --directory examples --version 0.75.0-rc.2 --skip-install --npm`
to make sure it works as intended.

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screenshots if this changes anything visual. -->

Author: TatianaKapos

packages/create-react-native-library/src/utils/generateExampleApp.ts

@@ -63,7 +63,7 @@ export default async function generateExampleApp({
     type === 'native'
       ? // `npx react-native init <projectName> --directory example --skip-install`
         [
-          'react-native@latest',
+          `react-native@${reactNativeVersion}`,
           'init',
           `${projectName}Example`,
           '--directory',