drop the py3-cairo-dev package. it is not used by anything.

At the point where something needs this, then we'll have a use
case for it that we can solve.

py3-cairo.yaml

@@ -87,19 +87,6 @@ subpackages:
           packages:
             - py3-supported-${{vars.pypi-package}}
 
-  - range: py-versions
-    name: py${{range.key}}-${{vars.pypi-package}}-dev
-    description: py${{range.key}} dev files for ${{vars.pypi-package}}
-    dependencies:
-      runtime:
-        - cairo-dev
-        - py${{range.key}}-${{vars.pypi-package}}
-      provides:
-        - py3-${{vars.pypi-package}}-dev
-      provider-priority: ${{range.value}}
-    pipeline:
-      - uses: split/dev
-
   - name: py3-supported-${{vars.pypi-package}}
     description: meta package providing ${{vars.pypi-package}} for supported python versions.
     dependencies: