Add pyproject.toml and remove deprecated setup commands

[cecyliaborek]

• add a minimal pyproject.toml, which is recommended for all Python projects
• remove deprecated setup.py commands like python setup.py install and python setup.py sdist
• update github workflows (ubuntu-latest points now to ubuntu-24.04 which doesn't have python 3.7 anymore)

Official python documentation on modernizing setup.py based projects

[Copilot]

Pull Request Overview

This PR modernizes the Python packaging setup by adopting the new pyproject.toml standard and removing deprecated setup.py commands. This aligns with current Python packaging best practices and official recommendations.

• Replaces verbose setup.py configuration with a minimal pyproject.toml file
• Updates installation and build commands from deprecated setup.py methods to modern alternatives
• Simplifies version management by consolidating version definition

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
pyproject.toml	Adds comprehensive project configuration following modern Python packaging standards
setup.py	Simplifies to minimal setup with dynamic version reading function
splunklib/__init__.py	Consolidates version definition to single string format
README.md	Updates installation instructions to use modern pip commands
.github/workflows/release.yml	Modernizes build process to use python -m build instead of deprecated setup.py commands

Comments suppressed due to low confidence (1)

pyproject.toml:2

• setuptools version 77.0.3 appears to be a very specific version that may not exist. Consider using a more standard version requirement like "setuptools>=68.0" or check if this exact version is available.

requires = ["setuptools>=77.0.3"]

[Copilot]

The dependency constraint has been tightened from just "deprecation" to "deprecation>=2.1.0". This could potentially break existing installations that have older versions. Consider whether this version requirement is necessary or if it should be more permissive.

Suggested change

	dependencies = ["deprecation>=2.1.0"]
	dependencies = ["deprecation"]

[cecyliaborek]

Based of master instead of develop