Update Rust crate heed to 0.21.0 (#21892)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [heed](https://redirect.github.com/Kerollmops/heed) |
workspace.dependencies | minor | `0.20.1` -> `0.21.0` |

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Release Notes:

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Cargo.lock

@@ -5611,9 +5611,9 @@ checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
 [[package]]
 name = "heed"
-version = "0.20.5"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d4f449bab7320c56003d37732a917e18798e2f1709d80263face2b4f9436ddb"
+checksum = "bd54745cfacb7b97dee45e8fdb91814b62bccddb481debb7de0f9ee6b7bf5b43"
 dependencies = [
  "bitflags 2.6.0",
  "byteorder",
@@ -5636,9 +5636,9 @@ checksum = "eb3130048d404c57ce5a1ac61a903696e8fcde7e8c2991e9fcfc1f27c3ef74ff"
 
 [[package]]
 name = "heed-types"
-version = "0.20.1"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d3f528b053a6d700b2734eabcd0fd49cb8230647aa72958467527b0b7917114"
+checksum = "13c255bdf46e07fb840d120a36dcc81f385140d7191c76a7391672675c01a55d"
 dependencies = [
  "bincode",
  "byteorder",

Cargo.toml

@@ -385,7 +385,7 @@ futures-lite = "1.13"
 git2 = { version = "0.19", default-features = false }
 globset = "0.4"
 handlebars = "4.3"
-heed = { version = "0.20.1", features = ["read-txn-no-tls"] }
+heed = { version = "0.21.0", features = ["read-txn-no-tls"] }
 hex = "0.4.3"
 html5ever = "0.27.0"
 hyper = "0.14"