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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Author: bors

Cargo.toml

@@ -52,7 +52,7 @@ derive_deref = "1.1.1"
 dialoguer = "0.9"
 diesel = { version = "1.4.8", features = ["postgres", "serde_json", "chrono", "r2d2"] }
 diesel_full_text_search = "1.0.0"
-diesel_migrations = { version = "1.3.0", features = ["postgres"] }
+diesel_migrations = { version = "1.4.0", features = ["postgres"] }
 dotenv = "0.15"
 flate2 = "1.0"
 futures-channel = { version = "0.3.1", default-features = false }
@@ -98,5 +98,5 @@ tower-service = "0.3.0"
 
 [build-dependencies]
 diesel = { version = "1.4.8", features = ["postgres"] }
-diesel_migrations = { version = "1.3.0", features = ["postgres"] }
+diesel_migrations = { version = "1.4.0", features = ["postgres"] }
 dotenv = "0.15"