CI: Unpin NumPy in the GMT Dev Tests workflow and fix the dataarray_to_matrix doctest (#3208) (#3226)

Author: seisman

.github/workflows/ci_tests_dev.yaml

@@ -143,7 +143,7 @@ jobs:
         run: |
           python -m pip install --pre --prefer-binary \
                         --extra-index https://pypi.anaconda.org/scientific-python-nightly-wheels/simple \
-                        'numpy<2' pandas xarray netCDF4 packaging \
+                        numpy pandas xarray netCDF4 packaging \
                         build contextily dvc geopandas ipython pyarrow rioxarray \
                         pytest pytest-cov pytest-doctestplus pytest-mpl pytest-rerunfailures pytest-xdist\
                         sphinx-gallery

pygmt/clib/conversion.py

@@ -124,6 +124,8 @@ def dataarray_to_matrix(grid):
         grid = grid.sortby(variables=list(grid.dims), ascending=True)
 
     matrix = as_c_contiguous(grid[::-1].to_numpy())
+    region = [float(i) for i in region]
+    inc = [float(i) for i in inc]
     return matrix, region, inc