Exclude transitive dependency on pre 5.7 version of JNA

[kenoir]

What does this change?

Follows #236, and required for the same reason. We are still pulling in an old version of the JNA library causing this issue (pre 5.7), see:

• https://github.com/java-native-access/jna/blob/master/CHANGES.md#release-570
• Enable building jna for Darwin arm64 java-native-access/jna#1238

We exclude the JNA lib as a transitive dep, which avoids packaging it and blowing up downstream consumers.

https://github.com/elastic/apm-agent-java/blob/be8add66d074febe16748691725b6cfe69f238d0/docs/setup-attach-api.asciidoc

Using publishLocal to try this out locally before release and running a project that incorporates this dependency where we've seen this issue, the runtime error is fixed and we can see the dependency excluded.

Resolves this issue: wellcomecollection/catalogue-api#737 (comment)

See the dep being excluded (jna-platform is still there, but jna is excluded).

How to test

• Tests pass?
• Consumers are free from error when trying to run projects that include this library on M1 macs.

How can we measure success?

Developers can run projects locally on their machines without issue.

Have we considered potential risks?

It's possible we hit one of the special conditions described in the caveats. We'll see this if consumers fail!