Added oldestdeps tox configuration and enable in CI

.github/workflows/ci_workflows.yml

@@ -35,20 +35,20 @@ jobs:
       envs: |
         # Tests without Qt. For now glfw can't run on MacOS runners in headless mode
         # so we only run on Linux and Windows.
-        - linux: py38-test
+        - linux: py38-test-oldestdeps
         - windows: py39-test
         - linux: py310-test
         - windows: py311-test
         - linux: py311-test-dev
 
         # Tests with Jupyter
-        - linux: py38-test-jupyter
+        - linux: py38-test-jupyter-oldestdeps
         - windows: py39-test-jupyter
         - linux: py310-test-jupyter
         - windows: py311-test-jupyter
 
         # Tests with Qt
-        - linux: py38-test-pyqt63
+        - linux: py38-test-pyqt63-oldestdeps
         - linux: py39-test-pyside63
         - linux: py310-test-pyqt64
         - linux: py311-test-dev-pyqt64

tox.ini

@@ -18,6 +18,9 @@ deps =
     pyside64: PySide6==6.4.*
     dev: glue-core @ git+https://github.com/glue-viz/glue
     dev: vispy @ git+https://github.com/vispy/vispy
+    oldestdeps: glue-core==1.13.*
+    oldestdeps: echo==0.6
+    oldestdeps: vispy==0.9.*
 extras =
     test: test
     pyqt63,pyqt64: pyqt