bump to ubuntu-latest as ubuntu-20.04 is no longer available

Author: alistairewj

.github/workflows/sqlite.yml

@@ -7,7 +7,7 @@ jobs:
   mimic-iv-sqlite:
     # only run if PR is approved
     if: github.event.review.state == 'approved'
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     container: python:3.10
 
     steps: