chore: bump version to 12.1.0 [skip ci]

[ryanthemanuel]

User facing changelog

n/a

Additional details

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Steps to test

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How has the user experience changed?

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PR Tasks

• [na] Have tests been added/updated?
• [na] Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• [na] Has a PR for user-facing changes been opened in cypress-documentation?
• [na] Have API changes been updated in the type definitions?

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