gha: reduce ClusterFuzzLite time limit

Now that our CI runs take ~5 minutes, we should reduce the
ClusterFuzzLite limit.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

Author: cyphar

.github/workflows/cflite-pr.yml

@@ -49,7 +49,7 @@ jobs:
       uses: google/clusterfuzzlite/actions/run_fuzzers@v1
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
-        fuzz-seconds: 600
+        fuzz-seconds: 300
         mode: 'code-change'
         sanitizer: ${{ matrix.sanitizer }}
         output-sarif: true