chore: Add the macOS runner to the matrix strategy

[realtimetodie]

Adds the macOS runner to the matrix strategy of the test workflow job.

[realtimetodie]

Related

• https://github.com/aspect-build/rules_js/pull/828
• https://github.com/aspect-build/rules_terser/pull/64
• https://github.com/aspect-build/rules_ts/pull/298
• https://github.com/aspect-build/rules_webpack/pull/89
• https://github.com/aspect-build/rules_rollup/pull/65
• https://github.com/aspect-build/rules_jest/pull/94
• https://github.com/aspect-build/rules_jasmine/pull/35
• https://github.com/aspect-build/rules_cypress/pull/27
• https://github.com/aspect-build/rules_deno/pull/15

[realtimetodie]

Tested and verified in a private repository.