feat: Add support for the audio/webm MIME type.

PiperOrigin-RevId: 972825855

Author: wanlin31

google/genai/_gaos/types/interactions/audiocontent.py

@@ -46,6 +46,7 @@
         "audio/opus",
         "audio/alaw",
         "audio/mulaw",
+        "audio/webm",
     ],
     UnrecognizedStr,
 ]

google/genai/_gaos/types/interactions/audiodelta.py

@@ -40,6 +40,7 @@
         "audio/opus",
         "audio/alaw",
         "audio/mulaw",
+        "audio/webm",
     ],
     UnrecognizedStr,
 ]