Upgrade to ubuntu 22.04 (#366)

Author: asherf

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
-        os: [ubuntu-20.04]
+        os: [ubuntu-22.04]
     runs-on: ${{ matrix.os }}
     name: "${{ matrix.os }} Python: ${{ matrix.python-version }}"
     services: