Regenerate pagespeedonline client

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/synth.py.
synthtool > Cloning https://github.com/googleapis/discovery-artifact-manager.git.
synthtool > Cleaning output directory.
synthtool > Installing dependencies.
synthtool > Generating pagespeedonline v5.
synthtool > 	1.28.0
synthtool > 	1.29.2
synthtool > 	1.30.1
Writing json metadata to clients/google-api-services-pagespeedonline/v5.metadata.json
synthtool > Generating pagespeedonline v4.
synthtool > 	1.28.0
synthtool > 	1.29.2
synthtool > 	1.30.1
Writing json metadata to clients/google-api-services-pagespeedonline/v4.metadata.json
synthtool > Generating pagespeedonline v2.
synthtool > 	1.28.0
synthtool > 	1.29.2
synthtool > 	1.30.1
Writing json metadata to clients/google-api-services-pagespeedonline/v2.metadata.json
synthtool > Generating pagespeedonline v1.
synthtool > 	1.28.0
synthtool > 	1.29.2
synthtool > 	1.30.1
Writing json metadata to clients/google-api-services-pagespeedonline/v1.metadata.json
synthtool > Wrote metadata to clients/google-api-services-pagespeedonline/synth.metadata.