Revert "Temporarily disable cifuzz"

This reverts commit 3146940.

Author: radarhere

.github/workflows/cifuzz.yml

@@ -24,8 +24,6 @@ concurrency:
 
 jobs:
   Fuzzing:
-    # Disabled until google/oss-fuzz#11419 upgrades Python to 3.9+
-    if: false
     runs-on: ubuntu-latest
     steps:
     - name: Build Fuzzers