Replace CAT_CAT with FIND_CONCATENATE; bump nf-core modules

[jonasscheid]

Closes #346 and bumps all remaining nf-core modules (bcftools/norm, bcftools/stats, gunzip, multiqc, snpsift/split) and subworkflows (utils_nextflow_pipeline, utils_nfschema_plugin) to latest. BioMart-dependent tests currently flake on upstream BioMart outages; peptides and proteins pipeline tests were re-run and pass.

PR checklist

• This comment contains a description of changes (with reason).
• If you've fixed a bug or added code that should be tested, add tests!
• If you've added a new tool - have you followed the pipeline conventions in the contribution docs
• If necessary, also make a PR on the nf-core/epitopeprediction branch on the nf-core/test-datasets repository.
• Make sure your code lints (nf-core pipelines lint).
• Ensure the test suite passes (nextflow run . -profile test,docker --outdir <OUTDIR>).
• Check for unexpected warnings in debug mode (nextflow run . -profile debug,test,docker --outdir <OUTDIR>).
• Usage Documentation in docs/usage.md is updated.
• Output Documentation in docs/output.md is updated.
• CHANGELOG.md is updated.
• README.md is updated (including new tool citations and authors/contributors).

[Joon-Klaps]

LGTM

[Joon-Klaps]

You do have to fix the tests first, as it seems like some files were no longer generated.

[jonasscheid]

Thanks, yes. Unfortunately, we are a currently blocked by a missing package release (epytope), which causes these failing tests. Working on that 👍🏼. I'll fix the failing tests when the package is released