Use JSONB for encrypted redirect URL

[dmjb]

When creating the migration in a previous PR, I used TEXT instead of JSONB. This migration fixes this.

Since the column is not used, and I can't cast between TEXT and JSONB, I am recreating the column in a transaction.

Summary

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Fixes #(related issue)

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Review Checklist:

• Reviewed my own code for quality and clarity.
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[stacklokbot]

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[coveralls]

coverage: 49.418% (+0.01%) from 49.407%
when pulling 2960df2 on use-jsonb-redirect-url
into 1eb80d3 on main.