Add Ubuntu 22.04 back into CI

Author: mattjala

.github/workflows/main.yml

@@ -31,7 +31,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-22.04, ubuntu-latest]
         python-version: ["3.10"]
         hdf5-branch: ["hdf5_1_14"]