remove setuptools from runtime dependencies

pyfaidx does not rely on setuptools during day to day operation, so it
can be safely removed from the runtime dependencies.

For the rationale, this change originates from the deprecation of the
Debian package python3-pkg-resources along the upcoming Python 3.13
reported in [Debian bug #1083691].  For short, python3-pkg-resources
happens to be pulled by the packaging tools when runtime dependency on
setuptools is declared.

[Debian bug #1083691]: https://bugs.debian.org/1083691

Signed-off-by: Étienne Mollier <[email protected]>

Author: emollier

pyproject.toml

@@ -27,7 +27,6 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Bio-Informatics"
 ]
 dependencies = [
-    "setuptools",
     "importlib_metadata",
     "packaging"
 ]