fix: Update semantic-release configuration for consistency and correct versioning

[Bjarten]

Summary

This PR addresses configuration inconsistencies and improves the semantic-release setup for the early-stopping-pytorch package. Changes were made to ensure proper versioning, tagging, and build process alignment, which should eliminate the warnings seen in recent CI runs.

Changes Made:

1. Updated pyproject.toml:

   • Corrected the version_variable to match the actual package path.
   • Consolidated the tag_format under [tool.semantic_release].
   • Added version_toml to synchronize version updates with pyproject.toml.
   • Set upload_to_pypi to false for now, as per project requirements.

2. Workflow Update (.github/workflows/release.yml):

   • Simplified permissions to contents: write for better security.
   • Retained workflow_dispatch trigger for manual release control.

Rationale

These changes ensure that versioning is consistently managed and that warnings are minimized, improving CI/CD pipeline efficiency. The configuration should now support smoother releases with semantic versioning and prevent potential issues with incorrect tag formats or misconfigured variables.