Bump serde_json from 1.0.74 to 1.0.79 (#11020)

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.74 to 1.0.79.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.74...v1.0.79)

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

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

substrate/primitives/rpc/Cargo.toml

@@ -18,4 +18,4 @@ sp-core = { version = "6.0.0", path = "../core" }
 rustc-hash = "1.1.0"
 
 [dev-dependencies]
-serde_json = "1.0.74"
+serde_json = "1.0.79"