actions: pin pytest-asyncio version for Ubuntu 20

Newest versions are no longer compatible with older pytest.

diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index 1dade3bcfa28c3b4a43e2b73aa5882ba66238d33..a7d4526087cc1f1bff60d578dab836e89cbfc083 100644 (file)
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -105,7 +105,7 @@ jobs:
               if: matrix.flavour != 'oldstuff'
 
             - name: Install newer pytest-asyncio
-              run: pip3 install -U pytest-asyncio
+              run: pip3 install -U pytest-asyncio==0.21.1
               if: matrix.flavour == 'ubuntu-20'
 
             - name: Install test prerequsites (from pip for Ubuntu 18)