What you can do here is create your object with javascript. Then you will be able to set whatever value in your data attribute.
Replace your body with that (note that I didn't set every attribute of your object):
<body>
<script>
// create the object
const obj = document.createElement("object");
obj.width = "910"
obj.height= "50"
// add any other attributes like that
// obj.type = ....
// obj.boder = ..
// just using a simple random here, but you can probably generate a string also
obj.data = "http://sandbox.serveur.prive/test.txt?v=" + Math.random()
// add the element to the body
document.body.appendChild(obj);
</script>
</body>
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