Update genai/bounding-box/boundingbox-with-txt-img.js

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: Guiners

genai/bounding-box/boundingbox-with-txt-img.js

@@ -105,8 +105,8 @@ async function createBoundingBox(
             type: 'INTEGER',
             format: 'int32',
           },
-          minItems: '4',
-          maxItems: '4',
+          minItems: 4,
+          maxItems: 4,
         },
         label: {
           type: 'STRING',