Python: False positive: Tuple Destructuring

**Description of the false positive**

CodeQL incorrectly identifies dataflow occurring from a constant value when a tuple is being destructured.

**Code samples or links to source code**

Here's it's very clear that `status` will always be `200` on this data flow path, but CodeQL incorrectly believes there is dataflow from the `res.json()` to the `status` variable.

https://github.com/Chainguard-Wolfi-Bites-Back/istio__istio/security/code-scanning/5

Start with the linked code-scanning result and the tuple-destructuring scenario described in the issue. Investigate how CodeQL models dataflow for the Python example, then verify that a constant status value is not reported as receiving dataflow from res.json().

Written by the indexing model from the issue text.