Bump serde_json from 1.0.80 to 1.0.81

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.80 to 1.0.81.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](serde-rs/json@v1.0.80...v1.0.81)

---
updated-dependencies:
- dependency-name: serde_json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -20,7 +20,7 @@ anyhow = "1.0.57"
 log = "0.4"
 semver = "1.0" # Keep in sync with version pulled by Cargo
 serde = { version = "1.0.137", features = ["derive"] }
-serde_json = "1.0.80"
+serde_json = "1.0.81"
 quote = "1.0.10"
 proc-macro2 = "1.0.32"