fix(deps): update flyway to v12 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.flywaydb:flyway-database-postgresql (source)	11.20.3 → 12.2.0
org.flywaydb:flyway-core (source)	11.20.3 → 12.2.0
org.flywaydb.flyway	11.20.3 → 12.2.0

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Release Notes

flyway/flyway (org.flywaydb:flyway-database-postgresql)

v12.2.0

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Configuration

📅 Schedule: Branch creation - Only on Wednesday ( * * * * 3 ) in timezone Europe/London, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

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[hmcts-jenkins-cnp]

Plan Result (stg)

No changes. Your infrastructure matches the configuration.