Downgrade Cython upper pin to stay below 3.0.0

For the moment, the latest major release of Cython seems to be unable
to cythonize `_geoslib.pyx` as Cython 0.29.x was successfully doing.

Author: molinav

CHANGELOG.md

@@ -10,6 +10,12 @@ https://keepachangelog.com/en/1.0.0/
 https://semver.org/spec/v2.0.0.html
 
 
+## [1.3.8]
+
+### Fixed
+- Downgrade upper pin for Cython requirement from 3.1 to 3.0 due to
+  build error triggered by `_geoslib.pyx` (solves issue [#581]).
+
 ## [1.3.7] - 2023-05-04
 
 ### Changed
@@ -957,6 +963,8 @@ https://semver.org/spec/v2.0.0.html
 - Fix glitches in drawing of parallels and meridians.
 
 
+[#581]:
+https://github.com/matplotlib/basemap/issues/581
 [#573]:
 https://github.com/matplotlib/basemap/issues/573
 [#564]:

packages/basemap/pyproject.toml

@@ -8,7 +8,7 @@ requires = [
     'numpy == 1.16.6; sys_platform != "darwin" and (python_version >= "3.7" and python_version <= "3.9")',
     'numpy == 1.16.6; python_version == "2.7" or (python_version >= "3.4" and python_version <= "3.6")',
     'numpy == 1.11.3; python_version == "2.6" or (python_version >= "3.2" and python_version <= "3.3")',
-    'cython >= 0.29, < 3.1; python_version >= "3.3" or python_version < "3.0"',
+    'cython >= 0.29, < 3.0; python_version >= "3.3" or python_version < "3.0"',
     'cython >= 0.26, < 0.27; python_version == "3.2"'
 ]
 build-backend = "setuptools.build_meta"

packages/basemap/requirements-setup.txt

@@ -1,6 +1,4 @@
 cython >= 0.29, < 3.0; python_version == "2.6"
 cython >= 0.29, < 3.0; python_version == "2.7"
 cython >= 0.26, < 0.27; python_version == "3.2"
-cython >= 0.29, < 3.0; python_version == "3.3"
-cython >= 0.29, < 3.0; python_version == "3.4"
-cython >= 0.29, < 3.1; python_version >= "3.5"
+cython >= 0.29, < 3.0; python_version >= "3.3"