adding bowtie2 version 2.5.4

[erinyoung]

There's a new version of bowtie2!

Release notes: https://github.com/BenLangmead/bowtie2/releases/tag/v2.5.4

Notably, this reverts some changes from 2.5.0.

I updated bowtie2 to 2.5.4 and samtools to 1.20

$ diff bowtie2/2.5.3/Dockerfile bowtie2/2.5.4/Dockerfile 
3c3
< FROM staphb/samtools:1.19 as samtools
---
> FROM staphb/samtools:1.20 as samtools
7c7
< ARG BOWTIE2VER=2.5.3
---
> ARG BOWTIE2VER=2.5.4

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