120 returncode executing Python code from a ResolvedContext within Maya 2022

Hi!

I've run into an issue running Python 3.7.4 code within a ResolvedContext in Maya 2022.3, where it errors and returns a returncode of 120. It looks like this return code indicates an error with the interpreter shutting down.
https://bugs.python.org/issue5319

**Rez version:** 2.103.4

**Reproduction steps**
Run the following snippet in the Maya Script Editor
```
from rez.resolved_context import ResolvedContext
context = ResolvedContext(["python"])
process = context.execute_command(args=['python', '-c', "import sys; print(sys.path)"])
print(process.communicate())
print(process.returncode)
```
```
>>> (None, None)
>>> 120
```

**Workaround**

The issue can be worked around fairly simply by redirecting the stdout and stderr for the Popen to subprocess.PIPE, e.g
```
from rez.resolved_context import ResolvedContext
context = ResolvedContext(["python"])
process = context.execute_command(args=['python', '-V'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
```

Let me know if there's any more information I can provide!

Thanks,
Nikhil

Start with rez.resolved_context.ResolvedContext.execute_command and reproduce the Maya 2022.3 case using the provided Python snippet. Compare process behavior with and without stdout and stderr pipes; done means the command completes without the unexpected returncode 120 while retaining usable output.

Written by the indexing model from the issue text.