`TestNutsCheckTrace.test_linalg` is flaky

This test is failing on `main`, but only sometimes: https://github.com/pymc-devs/pymc/runs/3841109220#step:7:1987

```
[XPASS(strict)] Start shape checks that were previously skipped run into ValueError
```

What can we do to make the test deterministic?


* PyMC/PyMC3 Version: `main`