Bump serde_json from 1.0.42 to 1.0.44

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.42 to 1.0.44.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.42...v1.0.44)

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

ledger-tool/Cargo.toml

@@ -13,7 +13,7 @@ bincode = "1.2.0"
 clap = "2.33.0"
 serde = "1.0.103"
 serde_derive = "1.0.103"
-serde_json = "1.0.42"
+serde_json = "1.0.44"
 serde_yaml = "0.8.11"
 solana-clap-utils = { path = "../clap-utils", version = "0.22.0" }
 solana-ledger = { path = "../ledger", version = "0.22.0" }