Fix Python 3.10 PYVERSION test regression

Author: rsgalloway

tests/fixtures/env/test.env

@@ -1,7 +1,7 @@
 #!/usr/bin/env envstack
 include: [default]
 all: &all
-  PYVERSION: $(python -c "import sys; print(f'{sys.version_info[0]}.{sys.version_info[1]}')")
+  PYVERSION: $(python -c "import sys; print(repr(f'{sys.version_info[0]}.{sys.version_info[1]}'))")
   PYTHONPATH: ${DEPLOY_ROOT}/lib/python${PYVERSION}
 darwin:
   <<: *all