Fix flaky ls425 integration tests

[BrianJKoopman]

Description

This PR fixes the flaky Lakeshore 425 integration tests.

Draft until I've figured out the fix.

Motivation and Context

These started being flaky all of a sudden.

How Has This Been Tested?

This will be tested in the PR checks.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.