chore: release 2.2.1b3 (#694)
chore: release 2.2.1b3 (#694)

* chore: release 2.2.1b3

* Updated CHANGELOG.md

Co-authored-by: release-please[bot] <6fb7beb84df8ef60a675db3372864553c0b582c5@users.noreply.github.com>
Co-authored-by: Vikash Singh <1319130075df6bda0c48aec63efc40780c306d41@users.noreply.github.com>
googleapis/python-spanner-django,googleapis/python-spanner-django