Update broken agent download link

[JonasKunz]

What does this PR do?

Cherry pick + update of #3086 on main.

[apmmachine]

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• Start Time: 2023-03-31T07:03:19.077+0000

• Duration: 1 min 57 sec

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[felixbarny]

There are several other places that need to be updated as well: https://github.com/search?q=repo%3Aelastic%2Fapm-agent-java%20central.sonatype.com&type=code

[JonasKunz]

There are several other places that need to be updated as well: https://github.com/search?q=repo%3Aelastic%2Fapm-agent-java%20central.sonatype.com&type=code

Good catch. I updated them and will also cherry-pick those changes onto the 1.x branch.