Adding augur version 24.3.0

[erinyoung]

There's a new version of augur! Release notes: https://github.com/nextstrain/augur/releases/tag/24.3.0

I just copied the files from 24.2.3.

Here's the diff between the two files:

$ diff augur/24.2.3/Dockerfile augur/24.3.0/Dockerfile
3c3
< ARG AUGUR_VER="24.2.3"
---
> ARG AUGUR_VER="24.3.0"

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• [X] The dockerfile successfully builds to a test target for the user creating the PR. (i.e. docker build --tag samtools:1.15test --target test docker-builds/samtools/1.15 )
• [X] Directory structure as name of the tool in lower case with special characters removed with a subdirectory of the version number (i.e. spades/3.12.0/Dockerfile)
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