Update dependency cargo-tarpaulin to v0.20.1 (#4839)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

.github/workflows/coverage.yml

@@ -7,7 +7,7 @@ on:
       - master
 
 env:
-  CARGO_TARPAULIN_VERSION: 0.20.0
+  CARGO_TARPAULIN_VERSION: 0.20.1
   DIESEL_CLI_VERSION: 1.4.1
   RUST_VERSION: 1.61.0