Merge in new common changes

Author: emilypgoogle

firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/common/server/Types.kt

@@ -66,7 +66,7 @@ constructor(@JsonNames("citations") val citationSources: List<CitationSources>)
 data class CitationSources(
   val startIndex: Int = 0,
   val endIndex: Int,
-  val uri: String,
+  val uri: String? = null,
   val license: String? = null,
 )
 

firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/internal/util/conversions.kt

@@ -228,7 +228,7 @@ internal fun com.google.firebase.vertexai.common.shared.Part.toPublic(): Part {
 }
 
 internal fun CitationSources.toPublic() =
-  CitationMetadata(startIndex = startIndex, endIndex = endIndex, uri = uri, license = license)
+  CitationMetadata(startIndex = startIndex, endIndex = endIndex, uri = uri ?: "", license = license)
 
 internal fun com.google.firebase.vertexai.common.server.SafetyRating.toPublic() =
   SafetyRating(