Replace wget with curl when setup macos job (#2539)

Summary:
I'm seeing lots of flaky macOS job failing to download buck2 from S3 https://github.com/pytorch/executorch/actions/runs/8364218071/job/22899003145#step:9:94.  Logging into the runner and run the command shows that using wget getting an invalid HTTPS certificate, but using curl is fine (weird).  The runner is probably having an issue with openssl setup (https://serverfault.com/questions/922222/why-does-curl-work-with-a-specific-https-site-but-wget-has-problems-with-certif), so we can figure it out latter while this is to make macOS signal less flaky.

Pull Request resolved: https://github.com/pytorch/executorch/pull/2539

Reviewed By: guangy10

Differential Revision: D55147403

Pulled By: huydhn

fbshipit-source-id: e42d693ba98ebe14f8fa9783f335ff2f9e06bd29