Prepare release v2.4.0 and automate PyPI publishing (#183)

Bump version to 2.4.0 (minor bump due to dropping Python 3.7 support). Enable and configure automated PyPI publishing via GitHub Actions using Trusted Publishers (OIDC).

Author: oscarhiggott

.github/workflows/ci.yml

@@ -283,19 +283,17 @@ jobs:
         run: pytest tests --cov=./src/pymatching --cov-report=xml
       - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v3
-  # upload_pypi:
-  #   needs: [build_wheels, build_sdist]
-  #   runs-on: ubuntu-latest
-  #   environment: pypi
-  #   permissions:
-  #     id-token: write
-  #   if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
-  #   steps:
-  #     - uses: actions/download-artifact@v4
-  #       with:
-  #         # unpacks all CIBW artifacts into dist/
-  #         pattern: cibw-*
-  #         path: dist
-  #         merge-multiple: true
+  upload_pypi:
+    needs: [merge_upload_artifacts]
+    runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist
 
-  #     - uses: pypa/gh-action-pypi-publish@release/v1
+      - uses: pypa/gh-action-pypi-publish@release/v1

src/pymatching/_version.py

@@ -1 +1 @@
-__version__ = "2.3.1"    # pragma no cover
+__version__ = "2.4.0"    # pragma no cover