Summary/Motivation:

When trying to run tests in WaterTap that depended on the IDAES PropertyTestHarness, I encountered a strange error in Pytest:

E                   pytest.PytestUnraisableExceptionWarning: Exception ignored in: <_io.FileIO name='C:\\Users\\[REDACTED]\\Repos\\idaes-pse\\.git\\refs/heads/diagnostics_toolbox_scaling' mode='rb' closefd=True>
E                   Enable tracemalloc to get traceback where the object was allocated.
E                   See https://docs.pytest.org/en/stable/how-to/capture-warnings.html#resource-warnings for more info.

..\..\..\..\..\miniforge3\envs\watertap-dev\Lib\site-packages\_pytest\unraisableexception.py:67: PytestUnraisableExceptionWarnin

diagnostics_toolbox_scaling was my local IDAES branch.

After doing some troubleshooting, I was able to trace this problem to ver.py:

        try:
>           ref = open(ref_file).read().strip()
                  ^^^^^^^^^^^^^^^^^^^^^
E           ResourceWarning: unclosed file <_io.TextIOWrapper name='C:\\Users\\[REDACTED]\\Repos\\idaes-pse\\.git\\refs/heads/diagnostics_toolbox_scaling' mode='r' encoding='cp1252'>

..\..\..\..\idaes-pse\idaes\ver.py:167: ResourceWarning

It appears that we had a minor memory leak from opening files without closing them. I've made some minor modifications to close the files after we're done with them.

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