CIfuzz: switch off 'dry_run' mode

Follow-up from #4960: now make it fail if it detects problems.

Closes #4998

.github/workflows/fuzz.yml

@@ -8,17 +8,16 @@ jobs:
       uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
       with:
         oss-fuzz-project-name: 'curl'
-        dry-run: true
+        dry-run: false
     - name: Run Fuzzers
       uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
       with:
         oss-fuzz-project-name: 'curl'
         fuzz-seconds: 600
-        dry-run: true
+        dry-run: false
     - name: Upload Crash
       uses: actions/upload-artifact@v1
       if: failure()
       with:
         name: artifacts
         path: ./out/artifacts
-