Ubuntu 20.04 has been retired on GitHub Actions

Author: jamis

.github/workflows/test.yml

@@ -10,12 +10,12 @@ jobs:
     env:
       CI: true
       TESTOPTS: "-v"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     continue-on-error: true
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-20.04 ]
+        os: [ ubuntu-22.04 ]
         ruby: ["2.7", "3.0", "3.1", "3.2", "3.3"]
         mongodb: ["4.4", "5.0", "6.0", "7.0", "8.0"]
         topology: [replica_set, sharded_cluster]