bump vcf2maf to ensembl-vep=113.4 and update containers

[JustinBellavance]

Bump ensembl-vep to 113.4 and change references to new seqera containers for vcf2maf.

PR checklist

Closes #XXX

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[mashehu]

Please use https links for the singularity container https://nf-co.re/docs/tutorials/nf-core_components/using_seqera_containers

[JustinBellavance]

Please use https links for the singularity container https://nf-co.re/docs/tutorials/nf-core_components/using_seqera_containers

Didn't see that. Thanks for pointing me in the right direction.