Bump reqwest from 0.9.20 to 0.9.21 (#6221)

Bumps [reqwest](https://github.com/seanmonstar/reqwest) from 0.9.20 to 0.9.21.
- [Release notes](https://github.com/seanmonstar/reqwest/releases)
- [Changelog](https://github.com/seanmonstar/reqwest/blob/v0.9.21/CHANGELOG.md)
- [Commits](https://github.com/seanmonstar/reqwest/compare/v0.9.20...v0.9.21)

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

validator/Cargo.toml

@@ -14,7 +14,7 @@ clap = "2.33.0"
 console = "0.9.0"
 log = "0.4.8"
 indicatif = "0.12.0"
-reqwest = { version = "0.9.20", default-features = false }
+reqwest = { version = "0.9.21", default-features = false }
 serde_json = "1.0.40"
 solana-client = { path = "../client", version = "0.20.0" }
 solana-core = { path = "../core", version = "0.20.0" }