fix(CI): Use venv rather than virtualenv in the validate-dags CI job. (#8526)

Author: sean-rose

.circleci/workflows.yml

@@ -425,7 +425,7 @@ jobs:
                 name: Install telemetry-airflow dependencies
                 command: |
                   cd ~/telemetry-airflow
-                  virtualenv .venv
+                  python3 -m venv .venv
                   source .venv/bin/activate
                   pip install -r requirements.txt
                   pip install -r requirements-dev.txt