Remove unneeded sdist verification

At this point in the pipeline, if the pyx file is not present in the
sdist, the pipeline should have failed before at the cibuildwheel step.

Author: molinav

.github/workflows/build.yml

@@ -230,26 +230,6 @@ jobs:
           python -m twine check dist/*.tar.gz
           python -m twine check dist/*.whl
 
-      - name: Verify sdist content
-        run: |
-          mkdir -p /tmp/sdist_test
-
-          # Find and extract basemap sdist
-          BASEMAP_SDIST=$(ls dist/basemap-*.tar.gz 2>/dev/null || ls dist/*basemap*.tar.gz 2>/dev/null | head -1)
-          tar -xvf "$BASEMAP_SDIST" -C /tmp/sdist_test
-
-          # Verify contents
-          echo "Files in extracted sdist:"
-          find /tmp/sdist_test -type f | grep -v "__pycache__" | sort
-
-          # Check for critical files
-          if [ -f "$(find /tmp/sdist_test -name "_geoslib.pyx")" ]; then
-            echo "✓ Source files verified in sdist"
-          else
-            echo "✗ Missing critical source files in sdist"
-            exit 1
-          fi
-
   upload:
     name: Upload packages
     needs: [build_data, build_sdist, build_wheels, check]