Bump serde from 1.0.98 to 1.0.99 (#5540)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.98 to 1.0.99.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](https://github.com/serde-rs/serde/compare/v1.0.98...v1.0.99)

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

utils/fixed_buf/Cargo.toml

@@ -10,7 +10,7 @@ edition = "2018"
 
 [dependencies]
 bincode = "1.1.4"
-serde = "1.0.98"
+serde = "1.0.99"
 
 [lib]
 name = "solana_fixed_buf"