remove galaxy-tool-util from build dependency

[jfennick]

Some of the build dependencies appear to be regular dependencies, and do not appear to be required at build time.
This may cause issues in certain specific situations. See this Dockerfile for a minimal reproducible example.
For now, this PR simply removes galaxy-tool-util from pyproject.toml (only).

FROM condaforge/miniforge3

# This works
# RUN conda install "python<3.10"

# Have to downgrade python to install pypy
RUN conda install "python<3.10" pypy

# Install binary system dependencies through conda (so we don't have to install compilers)
RUN conda install psutil

# This works
# RUN pip install cwltool

RUN conda install git
# Due to listing galaxy-tool-util as a build dependency,
# pip attempts to install conda-package-streaming and then zstandard from source and fails with:
# No such file or directory: 'cc'
RUN pip install cwltool@git+https://github.com/common-workflow-language/cwltool.git

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3404fd0) 83.79% compared to head (fea8bc1) 83.79%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1955   +/-   ##
=======================================
  Coverage   83.79%   83.79%           
=======================================
  Files          46       46           
  Lines        8231     8231           
  Branches     2186     2186           
=======================================
  Hits         6897     6897           
  Misses        858      858           
  Partials      476      476           

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[mr-c]

Sure. It was required for typing reasons, but the cast seem to be sufficient.