adding datasets version 16.38.1

[erinyoung]

There's a new version of datasets!

According to the release notes there is some added functionality to the VIRUS subcommand.

I copied the files from 16.35.0 and updated the version ARG. I also changed some formatting.

The full diff:

$ diff ncbi-datasets/16.35.0/Dockerfile ncbi-datasets/16.38.1/Dockerfile 
1c1
< FROM ubuntu:jammy as app
---
> FROM ubuntu:jammy AS app
3c3
< ARG DATASETS_VER="16.35.0"
---
> ARG DATASETS_VER="16.38.1"
17,20c17,20
<  wget \
<  ca-certificates \
<  unzip && \
<  apt-get autoclean && rm -rf /var/lib/apt/lists/*
---
>   wget \
>   ca-certificates \
>   unzip && \
>   apt-get autoclean && rm -rf /var/lib/apt/lists/*
37c37
< FROM app as test
---
> FROM app AS test

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