Update analyze.py [(#3088)](GoogleCloudPlatform/python-docs-samples#3088)

Fix: GoogleCloudPlatform/python-docs-samples#2991

This test should take around 10-15 seconds to run, but every once in awhile there seems to be something causing it to take a long time.

Author: nnegrey

samples/analyze/analyze.py

@@ -296,7 +296,7 @@ def video_detect_text_gcs(input_uri):
         features=features)
 
     print('\nProcessing video for text detection.')
-    result = operation.result(timeout=300)
+    result = operation.result(timeout=600)
 
     # The first result is retrieved because a single video was processed.
     annotation_result = result.annotation_results[0]