
A recent commit [1] started causing failures on py37 (see the related bug). This could have been avoided by having at least one py37 check/gate job running on requirements changes, so this commit adds one. Related-Bug: #1840551 [1] https://review.opendev.org/#/c/675816/ Change-Id: I4be10c36e7ef64028cb5646a9e455a2eb1710b1e