Add retries for JDK downloads

[edmorley]

A Java CNB build failed with a network/DNS related error in:
https://github.com/heroku/cnb-builder-images/actions/runs/10580292795/job/29314925685?pr=569#step:6:19

With:

[Installing OpenJDK 17.0.12]

[Error: OpenJDK download failed]
Could not download OpenJDK distribution.

Please try again. If this error persists, please open an issue on GitHub:
ERROR: failed to build: exit status 1
https://github.com/heroku/buildpacks-jvm/issues/new

Details: HttpError(Transport(Transport { kind: Dns, message: Some("resolve dns name 'heroku-buildpacks-jvm.s3.us-east-1.amazonaws.com:443'"), url: Some(Url { scheme: "https", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("heroku-buildpacks-jvm.s3.us-east-1.amazonaws.com")), port: None, path: "/openjdk/zulu/amd64/17.0.12.tar.gz", query: None, fragment: None }), source: Some(Custom { kind: Uncategorized, error: "failed to lookup address information: Try again" }) }))

ERROR: failed to build: executing lifecycle: failed with status code: 51
Error: Process completed with exit code 1.

Some retries might help prevent intermittent failures like this.