Auto merge of #4652 - rust-lang:renovate/cargo-tarpaulin-0.x, r=Turbo87

Update dependency cargo-tarpaulin to v0.20.0

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [cargo-tarpaulin](https://crates.io/crates/cargo-tarpaulin) | minor | `0.19.1` -> `0.20.0` |

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Author: bors

.github/workflows/coverage.yml

@@ -7,7 +7,7 @@ on:
       - master
 
 env:
-  CARGO_TARPAULIN_VERSION: 0.19.1
+  CARGO_TARPAULIN_VERSION: 0.20.0
   DIESEL_CLI_VERSION: 1.4.1
   RUST_VERSION: 1.59.0