chore(deps): Bump h2 from 0.3.20 to 0.3.21 (vectordotdev#18330)

Bumps [h2](https://github.com/hyperium/h2) from 0.3.20 to 0.3.21.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/master/CHANGELOG.md)
- [Commits](hyperium/h2@v0.3.20...v0.3.21)

---
updated-dependencies:
- dependency-name: h2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -269,7 +269,7 @@ futures-util = { version = "0.3.28", default-features = false }
 glob = { version = "0.3.1", default-features = false }
 governor = { version = "0.6.0", default-features = false, features = ["dashmap", "jitter", "std"], optional = true }
 grok = { version = "2.0.0", default-features = false, optional = true }
-h2 = { version = "0.3.20", default-features = false, optional = true }
+h2 = { version = "0.3.21", default-features = false, optional = true }
 hash_hasher = { version = "2.0.0", default-features = false }
 hashbrown = { version = "0.14.0", default-features = false, optional = true, features = ["ahash"] }
 headers = { version = "0.3.8", default-features = false }