DeprecationWarning: Do not use sequelize.isDefined().

[cccdz]

Sequelize v7
[SEQUELIZE0029] DeprecationWarning: Do not use sequelize.isDefined(). Use sequelize.models.hasByName instead.

[frank184]

Seeing this as well on Sequelize v7:

(node:233) [SEQUELIZE0029] DeprecationWarning: Do not use sequelize.isDefined(). Use sequelize.models.hasByName instead.
    at Sequelize.isDefined (/workspace/node_modules/@sequelize/core/src/sequelize.js:175:5)
    at SequelizeStorage.getModel (/workspace/packages/api/node_modules/umzug/src/storage/sequelize.ts:131:24)
    at new SequelizeStorage (/workspace/packages/api/node_modules/umzug/src/storage/sequelize.ts:127:40)
    at createMigrator (/workspace/packages/api/src/db/umzug.ts:33:14)
    at init (/workspace/packages/api/src/server.ts:37:20)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Added a PR that attempts to fix the warning: #710