Auto merge of #4043 - rust-lang:renovate/diesel_migrations-1.x, r=Turbo87
Auto merge of #4043 - rust-lang:renovate/diesel_migrations-1.x, r=Turbo87

Update Rust crate diesel_migrations to 1.4.0

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [diesel_migrations](https://crates.io/crates/diesel_migrations) | build-dependencies | minor | `1.3.0` -> `1.4.0` |
| [diesel_migrations](https://crates.io/crates/diesel_migrations) | dependencies | minor | `1.3.0` -> `1.4.0` |

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