Bump serde_json from 1.0.39 to 1.0.40 (#4881)

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.39 to 1.0.40.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.39...v1.0.40)

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

sdk/Cargo.toml

@@ -25,7 +25,7 @@ rand = "0.6.5"
 rayon = "1.1.0"
 serde = "1.0.94"
 serde_derive = "1.0.94"
-serde_json = "1.0.39"
+serde_json = "1.0.40"
 sha2 = "0.8.0"
 solana-ed25519-dalek = "0.2.0"
 solana-logger = { path = "../logger", version = "0.17.0" }