build(deps): bump h2 from 0.3.21 to 0.3.26 in /rust/experimental/server (#1625)

Bumps [h2](https://github.com/hyperium/h2) from 0.3.21 to 0.3.26.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/v0.3.26/CHANGELOG.md)
- [Commits](https://github.com/hyperium/h2/compare/v0.3.21...v0.3.26)

---
updated-dependencies:
- dependency-name: h2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/rust/experimental/server/Cargo.lock b/rust/experimental/server/Cargo.lock
index 87048fc..1ea6179 100644
--- a/rust/experimental/server/Cargo.lock
+++ b/rust/experimental/server/Cargo.lock
@@ -1196,9 +1196,9 @@
 
 [[package]]
 name = "h2"
-version = "0.3.21"
+version = "0.3.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91fc23aa11be92976ef4729127f1a74adf36d8436f7816b185d18df956790833"
+checksum = "81fe527a889e1532da5c525686d96d4c2e74cdd345badf8dfef9f6b39dd5f5e8"
 dependencies = [
  "bytes 1.5.0",
  "fnv",
@@ -1206,7 +1206,7 @@
  "futures-sink",
  "futures-util",
  "http",
- "indexmap 1.9.3",
+ "indexmap 2.0.0",
  "slab",
  "tokio",
  "tokio-util 0.7.9",