ci: re-introduce running CI on ubuntu-latest (#1837)

.github/workflows/fuzz.yml

@@ -18,10 +18,7 @@ jobs:
     # Skip the Fuzzing Jobs until we make them run fast and reliably. Currently they will
     # always recompile the codebase for each test and that takes way too long.
     if: false
-
-    # Pin to `20.04` instead of `ubuntu-latest`, until ubuntu-latest migration is complete
-    # See also <https://github.com/foundry-rs/foundry/issues/3827>
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         target:
@@ -62,4 +59,4 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: lcov.info
-          flags: fuzz-tests
+          flags: fuzz-tests