Update dependency grcov to v0.8.20

Author: renovate[bot]

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ env:
   # renovate: datasource=crate depName=cargo-deny versioning=semver
   CARGO_DENY_VERSION: 0.16.1
   # renovate: datasource=crate depName=grcov versioning=semver
-  GRCOV_VERSION: 0.8.19
+  GRCOV_VERSION: 0.8.20
   # renovate: datasource=npm depName=pnpm
   PNPM_VERSION: 9.12.1
   # renovate: datasource=docker depName=postgres