Bump minimum supported python version to 3.10 (#1176)

Bump oldest numpy

Trying to get numpy to install

Add MacOS 3.10 test

Update numpy pin here as well

Bump oldest supported scipy

Updated versions in contributing.rst

Author: rosteen

.github/workflows/ci_workflows.yml

@@ -37,20 +37,15 @@ jobs:
             python: '3.12'
             toxenv: py312-test
 
-          - name: Python 3.10
-            os: ubuntu-latest
+          - name: Python 3.10 (MacOS)
+            os: macos-latest
             python: '3.10'
             toxenv: py310-test
 
-          - name: Python 3.9
+          - name: Python 3.10 with oldest supported version of key dependencies
             os: ubuntu-latest
-            python: 3.9
-            toxenv: py39-test
-
-          - name: Python 3.8 with oldest supported version of key dependencies
-            os: ubuntu-20.04
-            python: 3.8
-            toxenv: py38-test-oldestdeps
+            python: '3.10'
+            toxenv: py310-test-oldestdeps
 
     steps:
     - name: Checkout code

CHANGES.rst

@@ -12,6 +12,8 @@ Bug Fixes
 Other Changes and Additions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+- Dropped support for python 3.9. [#1176]
+
 - ``utils.wcs_utils.refraction_index`` (and thus ``air_to_vac`` and ``vac_to_air``)
   now defaults to ``Morton2000`` as the method instead of ``Griesen2006``. [#1169]
 

docs/contributing.rst

@@ -107,7 +107,7 @@ Before you submit a pull request, check that it meets these guidelines:
 2. If the pull request adds functionality, the docs should be updated. Put
    your new functionality into a function with a docstring, and add the
    feature to the list in README.rst.
-3. The pull request should work for Python 3.9 - 3.11, and for PyPy. Check
+3. The pull request should work for Python 3.10 - 3.12, and for PyPy. Check
    that all required tests passed in the Github Actions CI section at the
    bottom of your pull request.
 

setup.cfg

@@ -14,9 +14,9 @@ github_project = astropy/specutils
 [options]
 zip_safe = False
 packages = find:
-python_requires = >=3.8
+python_requires = >=3.10
 install_requires =
-    numpy>=1.19
+    numpy>=1.24
     scipy>=1.3
     astropy>=5.1
     gwcs>=0.18

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{38,39,310,311,312}-test{,-devdeps,-oldestdeps,-predeps}{,-cov,-external}
+    py{310,311,312}-test{,-devdeps,-oldestdeps,-predeps}{,-cov,-external}
     linkcheck
     codestyle
 isolated_build = true
@@ -38,8 +38,8 @@ description =
 deps =
     cov: pytest-cov
 
-    oldestdeps: numpy==1.19.*
-    oldestdeps: scipy==1.3.*
+    oldestdeps: numpy==1.24.4
+    oldestdeps: scipy==1.8.*
     oldestdeps: astropy==5.1.*
     oldestdeps: gwcs==0.18.*
     oldestdeps: asdf-astropy==0.3.*