Run fuzz testing on ubuntu-latest

Needed due to retirement of ubuntu 22.04

Author: davidv1992

.github/workflows/rust.yml

@@ -107,7 +107,7 @@ jobs:
 
   fuzz:
     name: Smoke-test fuzzing targets
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
         uses: actions/checkout@v4