build(deps): bump h2 from 0.3.19 to 0.3.21 (#30215)

Bumps [h2](https://github.com/hyperium/h2) from 0.3.19 to 0.3.21.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/hyperium/h2/compare/v0.3.19...v0.3.21)

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

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

Cargo.lock

@@ -2585,9 +2585,9 @@ checksum = "b1334b94d8ce67319ddc44663daef53d8c1538629a11562530c981dbd9085b9a"
 
 [[package]]
 name = "h2"
-version = "0.3.19"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d357c7ae988e7d2182f7d7871d0b963962420b0678b0997ce7de72001aeab782"
+checksum = "91fc23aa11be92976ef4729127f1a74adf36d8436f7816b185d18df956790833"
 dependencies = [
  "bytes",
  "fnv",