Auto merge of #4251 - rust-lang:renovate/clap-3.x, r=Turbo87

Update Rust crate clap to v3.0.0-rc.3

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [clap](https://crates.io/crates/clap) | dependencies | patch | `=3.0.0-rc.0` -> `=3.0.0-rc.3` |

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Author: bors

Cargo.lock

@@ -34,7 +34,7 @@ base64 = "0.13"
 cargo-registry-markdown = { path = "cargo-registry-markdown" }
 cargo-registry-s3 = { path = "cargo-registry-s3" }
 chrono = { version = "0.4.19", features = ["serde"] }
-clap = { version = "=3.0.0-rc.0", features = ["derive", "unicode"] }
+clap = { version = "=3.0.0-rc.3", features = ["derive", "unicode"] }
 
 conduit = "0.10.0"
 conduit-conditional-get = "0.10.0"