Update dataset links and tags of nextclade to be compatible with v3+

[Joon-Klaps]

---

name: New Config
about: A new cluster config

Linked to nf-core/viralrecon#446 and nf-core/test-datasets#1378

Please follow these steps before submitting your PR:

• If your PR is a work in progress, include [WIP] in its title
• Your PR targets the master branch
• You've included links to relevant issues, if any

Steps for adding a new config profile:

• Add your custom config file to the conf/ directory
• Add your documentation file to the docs/ directory
• Add your custom profile to the nfcore_custom.config file in the top-level directory
• Add your custom profile to the README.md file in the top-level directory
• Add your profile name to the profile: scope in .github/workflows/main.yml
• OPTIONAL: Add your custom profile path and GitHub user name to .github/CODEOWNERS (**/<custom-profile>** @<github-username>)

[jfy133]

I'm not 💯 familiar with this type of genomes.config (I didn't realise we allowed non-instutional configs here), but conceptually looks OK to me :)

[robsyme]

As mentioned here, I think this breaks the viralrecon pipeline using the test profile. The current version of viralrecon uses nextclade v2.12, which is not compatible with these references.

I'd recommend rolling this back and thinking about putting these references under a different flag?