Add renovate comments to environment.yml

[edmundmiller]

Essentially we need to add to all the environment.ymls

channels:
  - conda-forge
  - bioconda
dependencies:
  # renovate: datasource=conda depName=bioconda/bwa
  - bwa=0.7.18
  # renovate: datasource=conda depName=bioconda/samtools
  - samtools=1.20
  # renovate: datasource=conda depName=bioconda/htslib
  - htslib=1.20.0

We can also keep the channel definitions if the consensus is that they're important. I've got a PR to enable either #5400

channels:
  - conda-forge
  - bioconda
dependencies:
  # renovate: datasource=conda depName=bioconda/bwa
  - bioconda::bwa=0.7.18
  # renovate: datasource=conda depName=bioconda/samtools
  - bioconda::samtools=1.20
  # renovate: datasource=conda depName=bioconda/htslib
  - bioconda::htslib=1.20.0

[edmundmiller]

Discussed in the maintainers meeting. Keeping the bioconda:: because we can, and that way we're specific about it. We'll support the dependencies without the channel as well.

[ewels]

Related: nf-core/tools#3184 for tools integration. If that's done first, the bulk addition in this PR can be automated.