Add gemini-2.5-flash to video models to test

Author: altxtech

spec/fixtures/vcr_cassettes/chat_video_models_gemini_gemini-2_5-flash_can_understand_local_videos.yml

@@ -34,6 +34,11 @@
   { provider: :vertexai, model: 'gemini-2.5-flash' }
 ].freeze
 
+VIDEO_MODELS = [
+  { provider: :gemini, model: 'gemini-2.0-flash' },
+  { provider: :gemini, model: 'gemini-2.5-flash' },
+]
+
 AUDIO_MODELS = [
   { provider: :openai, model: 'gpt-4o-mini-audio-preview' },
   { provider: :gemini, model: 'gemini-2.5-flash' }