Auto merge of #4059 - rust-lang:renovate/lettre-0.x, r=Turbo87

Update Rust crate lettre to 0.10.0-rc.3

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [lettre](https://crates.io/crates/lettre) | dependencies | patch | `0.10.0-beta.3` -> `0.10.0-rc.3` |

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Author: bors

Cargo.toml

@@ -63,7 +63,7 @@ http = "0.2"
 hyper = { version = "0.14", features = ["client", "http1"] }
 indexmap = { version = "1.7.0", features = ["serde-1"] }
 jemallocator = { version = "0.3", features = ['unprefixed_malloc_on_supported_platforms', 'profiling'] }
-lettre = { version = "0.10.0-beta.3", default-features = false, features = ["file-transport", "smtp-transport", "native-tls", "hostname", "builder"] }
+lettre = { version = "0.10.0-rc.3", default-features = false, features = ["file-transport", "smtp-transport", "native-tls", "hostname", "builder"] }
 license-exprs = "1.6"
 minijinja = "0.6.0"
 oauth2 = { version = "4.1.0", default-features = false, features = ["reqwest"] }