Fix Liquibase changeset IDs to match migration file numbers

Changeset IDs were not updated when migration files were renumbered
during rebase (003→004 for Postgres, 002→003 for MySQL).

Author: endrju19

okapi-mysql/src/main/resources/com/softwaremill/okapi/db/mysql/003__add_claim_index.sql

@@ -1,4 +1,4 @@
 --liquibase formatted sql
---changeset outbox:002
+--changeset outbox:003
 
 CREATE INDEX idx_outbox_status_created_at ON outbox (status, created_at);

okapi-postgres/src/main/resources/com/softwaremill/okapi/db/004__add_claim_index.sql

@@ -1,4 +1,4 @@
 --liquibase formatted sql
---changeset outbox:003
+--changeset outbox:004
 
 CREATE INDEX IF NOT EXISTS idx_outbox_status_created_at ON outbox (status, created_at);