Bump serde_json from 1.0.38 to 1.0.39

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.38 to 1.0.39.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.38...v1.0.39)

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

fullnode-config/Cargo.toml

@@ -17,7 +17,7 @@ dirs = "1.0.5"
 log = "0.4.2"
 serde = "1.0.88"
 serde_derive = "1.0.88"
-serde_json = "1.0.38"
+serde_json = "1.0.39"
 solana-netutil = { path = "../netutil", version = "0.12.0" }
 solana-sdk = { path = "../sdk", version = "0.12.0" }
 untrusted = "0.6.2"