DO NOT MERGE: Websecurityscanner: enum-order only synth

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/websecurityscanner/artman_websecurityscanner_v1alpha.yaml.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:229601142daed005bf56fbaa21a02cf7aa0b261b57677d38306f8013e536de7a
Status: Image is up to date for googleapis/artman:latest
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/websecurityscanner-v1alpha.
synthtool > Cleaned up 0 temporary directories.

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[tseaver]

Only changes due to googleapis/gapic-generator#2319.