Update dependency strong_migrations to v1.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
strong_migrations	'1.7.0' -> '1.8.0'

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Release Notes

ankane/strong_migrations (strong_migrations)

v1.8.0

Compare Source

• Added check for add_column with auto-incrementing columns
• Updated instructions for removing a column to append to ignored_columns
• Fixed check for adding a column with a default value for MySQL and MariaDB

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[mjankowski]

I think the strong_migrations gem bump is fine, but it's also bumped i18n which has exposed the reserved keyword thing.

I've opened glebm/i18n-tasks#552 and ruby-i18n/i18n#678 to attempt to sort that out upstream.