chore(Showcase): Update to Showcase 0.22.0 (#1362)
chore(Showcase): Update to Showcase 0.22.0 (#1362)

Co-authored-by: Anthonios Partheniou <50de7473c4bcd6fb06c46bebfdc91e30df56824a@google.com>
googleapis/gapic-generator-python,googleapis/gapic-generator-python