Invalid cross-device link when running tox -e generate

Describe your environment

Using Python 3.9 on linux, the only interesting part is that my /tmp and the repo checkout are on different filesystems.

Steps to reproduce

Run tox -e generate

What is the expected behavior?
A working script

What is the actual behavior?

Traceback (most recent call last):
  File "/home/michael/work/opentelemetry-python-contrib/scripts/generate_instrumentation_bootstrap.py", line 120, in <module>
    compare()
  File "/home/michael/work/opentelemetry-python-contrib/scripts/generate_instrumentation_bootstrap.py", line 114, in compare
    os.replace(gen_path, "bootstrap_gen.py")
OSError: [Errno 18] Invalid cross-device link: '/tmp/tmphlewuek9/new.py' -> 'bootstrap_gen.py

Additional context
I worked around it by adding a line to tox.ini to set $TMP to a directory on the same filesystem. Wouldn't surprise me if others have seen this issue. Not sure if anyone has a preferred way of fixing it - this clearly isn't, probably fixing the os.replace() call with a copy would work.

Start with scripts/generate_instrumentation_bootstrap.py, especially compare() around the os.replace call at line 114, then inspect tox.ini and run tox -e generate with /tmp and the repository on different filesystems. Done means the generation script completes and produces a working bootstrap_gen.py without the cross-device link error.