Release prep v9.1.0

[github-actions]

Automated release-prep through pdk-templates from commit f78c7a2.
Please verify before merging:

• last nightly run is green
• Changelog is readable and has no unlabeled pull requests
• Ensure the changelog version and metadata version match

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[LukasAud]

LGTM

[kenyon]

This should have been a major release.

[b4ldr]

Was just comming here to echo kenyon comment this should have been a major release as it included the following PR that is marked backwards-incompatable

• (CONT-773) Add Support for Puppet 8 / Remove Support for Puppet 6 (CONT-773) Add Support for Puppet 8 / Remove Support for Puppet 6 #1101 (david22swan)