ci: ubuntu22 for python 3.7

Author: jvdd

.github/workflows/ci-tsdownsample.yml

@@ -50,9 +50,13 @@ jobs:
         exclude:  # Python < 3.8 is not supported on Apple Silicon ARM64
           - os: macOS-latest
             python-version: '3.7'
+          - os: ubuntu-latest
+            python-version: '3.7'
         include:  # So run on older version on Intel CPU
           - os: macOS-13
             python-version: '3.7'
+          - os: ubuntu-22.04
+            python-version: '3.7'
 
     env:
       PYTHON: ${{ matrix.python-version }}