Auto merge of #11622 - weihanglo:coc, r=ehuss

Link CoC to www.rust-lang.org/conduct.html Just noticed that Cargo is missing a CoC file while browsing its open source project metrics. This PR effectively does what `rust-lang/rust` and others projects do.
rust-lang · Jan 25, 2023 · 3fee600 · 3fee600
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+# The Rust Code of Conduct
+
+The Code of Conduct for this repository [can be found online](https://www.rust-lang.org/conduct.html).