CI: run ASAN+UBSAN on a newer OS image
...so that we don't waste time debugging bugs which have been already
fixed.
@@ -79,7 +79,7 @@ jobs:
}
- {
name: "ASAN and UBSAN",
- os: "ubuntu-18.04",
+ os: "ubuntu-20.04",
build-type: "Debug",
dep-build-type: "Debug",
cc: "clang",
