Fix FutureWarnings (#2138)
Fix FutureWarnings (#2138)

* Fix FutureWarnings

Step #3: /workspace/clusterfuzz/src/python/lib/clusterfuzz/stacktraces/constants.py:76: FutureWarning: Possible nested set at position 4
Step #3:   r'\s*[[][^]]*[:]([^](]*).*[]].*Check failed[:]\s*(.*)')
Step #3: /workspace/clusterfuzz/src/python/lib/clusterfuzz/stacktraces/constants.py:201: FutureWarning: Possible nested set at position 3
Step #3:   r'.*[[][^]]*[:]([^](]*).*[]].*Security CHECK failed[:]\s*(.*)\.\s*')
Step #3: /workspace/clusterfuzz/src/python/lib/clusterfuzz/stacktraces/constants.py:203: FutureWarning: Possible nested set at position 3
Step #3:   r'.*[[][^]]*[:]([^](]*).*[]].*Security DCHECK failed[:]\s*(.*)\.\s*')

* Simplify.
google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz