Bump JNA to 5.16.0

15.0.1 can't be released on the Play Store because JNA's x86_64 libjnidispatch.so binary isn't built for 16KiB pages.

We currently take the binary from jna-5.14.0.aar, so we'll have to bump it to 5.16.0 at least, as it's the release that contains the fix to https://github.com/java-native-access/jna/issues/1618.

After that, we'll have to build and sign again.

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