Only run a single nox session for each version of Python in GitHub Actions matrix

Also:
- Temporarily disable dependency caching in GitHub Actions
- For Azure Pipelines MacOs testing, add Python 3.9 and remove 3.5

1 files changed, 2 insertions, 2 deletions

diff --git a/noxfile.py b/noxfile.py
index a46c008e..91533f1f 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -1,7 +1,7 @@
 import nox
 
 
-@nox.session(python=['3.7'])
+@nox.session(python=['3.9'])
 def docs(session):
     session.install('sphinx',
                     'sphinx-rtd-theme',
@@ -15,7 +15,7 @@ def docs(session):
                 '-d', '{}/doctrees'.format(tmpdir), '.', '{}/html'.format(tmpdir))
 
 
-@nox.session(python=['3.5.2', '3.5.3', '3.5', '3.6', '3.7', '3.8', '3.9'])
+@nox.session(python=['3.6', '3.7', '3.8', '3.9', '3.10-dev'])
 @nox.parametrize('plugin', [None,
                             'ext_test',
                             'template',