aws s3 links

[SPPearce]

We currently have three modules that use a link to a s3 bucket (all to the same database)

./tests/modules/nf-core/amps/main.nf
./modules/nf-core/malt/build/tests/main.nf.test
./modules/nf-core/malt/run/tests/main.nf.test

These don't seem to currently work on the CI/CD, and so something needs doing to fix these.
Presumably we don't want them for the same reason as github links.