pip-update: Never write pkg_resources to requirements.txt

e2e_tests/update_requirementstxt.sh

@@ -12,7 +12,7 @@ pip3 list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1 | while re
     pip install --upgrade "${package}"
     version="$(pip show "${package}" | grep '^Version' | cut -d ' ' -f 2)"
     message="e2e_tests/pip: Update ${package} to ${version}"
-    pip freeze > requirements.txt
+    pip freeze | grep -v '^pkg_resources' > requirements.txt
     git add ./requirements.txt
     git commit --message "${message}"
 done