This removes the need for an explicit `sys_settrace_features.py.exp` file.
This means that people testing locally will also need to install Python
3.11 in some way, such as with pyenv or uv, and use it during
`make VARIANT=coverage test`, or they will get failures.
When using Python from GitHub actions/setup-python, pip3 can't be wrapped
by sudo, because this invokes the operating system python instead.
Signed-off-by: Jeff Epler <jepler@gmail.com>
a9801f9960