adding metaphlan version 4.1.1

[erinyoung]

There's a new version of metaphlan!

According to the release notes, there are some new features https://github.com/biobakery/MetaPhlAn/releases/tag/4.1.1

There are new, updated databases, but these are not intended to be included in the image.

Since the conda bin is in path, we don't need the mamba dockerfile activate, so I've removed it.

Here are is the diff between 4.1.0 and 4.1.1:

$ diff metaphlan/4.1.0/Dockerfile metaphlan/4.1.1/Dockerfile 
1c1
< FROM mambaorg/micromamba:1.5.6 as app
---
> FROM mambaorg/micromamba:1.5.8 as app
3c3
< ARG METAPHLAN_VER="4.1.0"
---
> ARG METAPHLAN_VER="4.1.1"
9c9
< LABEL base.image="mambaorg/micromamba:1.5.6"
---
> LABEL base.image="mambaorg/micromamba:1.5.8"
36,37c36
< ENV ENV_NAME="base"
< ARG MAMBA_DOCKERFILE_ACTIVATE=1
---
> RUN metaphlan --help

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• [X] Include a description of what is in this pull request in this message.
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• [X] Create a simple container-specific README.md in the same directory as the Dockerfile (i.e. spades/3.12.0/README.md)
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• [X] Dockerfile includes the recommended LABELS
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