Fix 'Dev' link in compatibility table
@@ -233,7 +233,7 @@ Compatibility with GMT/Python/NumPy versions
- GMT
- Python
- NumPy
- * - `Dev <https://github.com/GenericMappingTools/pygmt/milestone/9>`_ (upcoming release)
+ * - `Dev <https://github.com/GenericMappingTools/pygmt/milestones>`_ (upcoming release)
- `Dev Documentation <https://www.pygmt.org/dev>`_ (reflects `main branch <https://github.com/GenericMappingTools/pygmt>`_)
- >=6.3.0
- >=3.8
