BLD: Set python latest supported version to 3.11 (skypyproject#588)

.github/workflows/compatibility.yaml

@@ -7,8 +7,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python: [3.9]
-        toxenv: [py39-test, py39-test-dev]
+        python: ['3.11']
+        toxenv: [py311-test, py311-test-dev]
     steps:
     - name: Checkout Repository
       uses: actions/checkout@v4

.github/workflows/tests.yaml

@@ -19,8 +19,8 @@ jobs:
 
           - name: latest supported versions
             os: ubuntu-latest
-            python: 3.9
-            toxenv: py39-test-all-latest-cov
+            python: '3.11'
+            toxenv: py311-test-all-latest-cov
             toxposargs: --cov-report=xml:${GITHUB_WORKSPACE}/coverage.xml
 
           - name: oldest supported versions
@@ -30,13 +30,13 @@ jobs:
 
           - name: macOS latest supported
             os: macos-latest
-            python: 3.9
-            toxenv: py39-test-latest
+            python: '3.11'
+            toxenv: py311-test-latest
 
           - name: Windows latest supported
             os: windows-latest
-            python: 3.9
-            toxenv: py39-test-latest
+            python: '3.11'
+            toxenv: py311-test-latest
 
     steps:
     - name: Checkout Repository

tox.ini

@@ -1,9 +1,9 @@
 [tox]
 envlist =
-    py{36,37,38,39}-test{,-all}{,-dev,-latest,-oldest}{,-cov}
-    py{36,37,38,39}-test-numpy{116,117,118,119,120,121}
-    py{36,37,38,39}-test-scipy{12,13,14,15,16,17}
-    py{36,37,38,39}-test-astropy{40,41,42,43}
+    py{36,37,38,39,310,311}-test{,-all}{,-dev,-latest,-oldest}{,-cov}
+    py{36,37,38,39,310,311}-test-numpy{116,117,118,119,120,121}
+    py{36,37,38,39,310,311}-test-scipy{12,13,14,15,16,17}
+    py{36,37,38,39,310,311}-test-astropy{40,41,42,43}
     build_docs
     linkcheck
     codestyle