fix: upgrade setuptools in virtualenv

[amrox]

local test run:

❯ ./bats/bin/bats  --verbose-run integration-tests.bats
integration-tests.bats
 ✓ install with system python no asdf
 ✓ install with system python via asdf
 ✓ install with asdf python 3.8.10
 ✓ install with asdf python 3.5.10 system python 3.6
 ✓ install with asdf python 3.5.10 no system python3
 ✓ check latest with pip version 19.3
 ✓ check latest with pip version 20.0
 ✓ check latest with pip version 20.1
 ✓ check latest with pip version 20.2
 ✓ check latest with pip version 20.3
 ✓ check latest with pip version 21.3
 ✓ check $ASDF_PYAPP_DEFAULT_PYTHON_PATH works
 ✓ install with local python in direnv
 ✓ install with python plugin integration
 ✓ install with python plugin integration without python plugin installed
 ✓ install with asdf direnv no shims no global python
 ✓ install with asdf direnv no shims with global python
 ✓ check ASDF_PYAPP_VENV_COPY_MODE=1
 ✓ check app ansible-base latest
 ✓ check app ansible-core latest
 ✓ check app awscli latest
 ✓ check app awsebcli latest
 ✓ check app aws-sam-cli latest
 - check app black latest (skipped)
 ✓ check app black 21.5b2
 ✓ check app bpython latest
 ✓ check app conan latest
 ✓ check app doit latest
 ✓ check app flake8 latest
 - check app hy latest (skipped)
 ✓ check app hy 0.20.0@3.8.2
 ✓ check app meson latest
 ✓ check app mypy latest
 ✓ check app pipenv latest
 ✓ check app salt latest
 ✓ check app sphinx latest
 ✓ check app aws-ssm-tools latest
 ✓ check app yawsso latest
 ✓ check app pre-commit latest

39 tests, 0 failures, 2 skipped