example: use the tuple with the updated "in_compliance" value returned by _replace()

[jayaseelan-james]

• This contribution adheres to CONTRIBUTING.md.

What does this Pull Request accomplish?

• While expanding the nidcpower_source_dc_voltage measurement to support multisite in example: update nidcpower measurement to support multiple instrument sessions #676, I overlooked the update to the in_compliance value in the _Measurement tuple. Since tuples are immutable, invoking _replace() on a tuple doesn't modify the original tuple; instead, it returns a new tuple with the updated values.
• In the current implementation, the object returned by the _replace() method wasn't captured or assigned to any variable, resulting in the use of the original tuple, which did not have the correct "in_compliance" value. This PR ensures that the tuple returned by the _replace() method is properly appended to the final measurements list.

Why should this Pull Request be merged?

• Fixes the bug where the in_compliance value was not assigned properly.

What testing has been done?

• Manually verified by running the measurement.

[github-actions]

Test Results

    30 files  ±0      30 suites  ±0   39m 8s ⏱️ - 1m 46s
   648 tests ±0     648 ✅ ±0      0 💤 ±0  0 ❌ ±0 
16 060 runs  ±0  14 990 ✅ ±0  1 070 💤 ±0  0 ❌ ±0 

Results for commit 767173c. ± Comparison against base commit ad51e4d.