setuptools 80 changed setup.py develop to use PEP 660

This breaks our test suite which expects egg-link files to be created.

Author: sbidoul

tests/requirements-common_wheels.txt

@@ -5,7 +5,7 @@
 # 4. Replacing the `setuptools` entry below with a `file:///...` URL
 # (Adjust artifact directory used based on preference and operating system)
 
-setuptools >= 40.8.0, != 60.6.0
+setuptools >= 40.8.0, != 60.6.0, <80
 wheel
 # As required by pytest-cov.
 coverage >= 4.4

tests/requirements.txt

@@ -6,7 +6,7 @@ pytest-cov
 pytest-rerunfailures
 pytest-xdist
 scripttest
-setuptools
+setuptools<80
 # macOS (darwin) arm64 always uses virtualenv >= 20.0
 # for other platforms, it depends on python version
 virtualenv < 20.0 ; python_version < '3.10' and (sys_platform != 'darwin' or platform_machine != 'arm64')