Bump enumn from 0.1.5 to 0.1.8 (#7226)

Bumps [enumn](https://github.com/dtolnay/enumn) from 0.1.5 to 0.1.8.
- [Release notes](https://github.com/dtolnay/enumn/releases)
- [Commits](https://github.com/dtolnay/enumn/compare/0.1.5...0.1.8)

---
updated-dependencies:
- dependency-name: enumn
  dependency-type: direct:production
  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>

polkadot/Cargo.lock

@@ -2130,13 +2130,13 @@ dependencies = [
 
 [[package]]
 name = "enumn"
-version = "0.1.5"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "038b1afa59052df211f9efd58f8b1d84c242935ede1c3dbaed26b018a9e06ae2"
+checksum = "48016319042fb7c87b78d2993084a831793a897a5cd1a2a67cab9d1eeb4b7d76"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.15",
 ]
 
 [[package]]

polkadot/runtime/common/slot_range_helper/Cargo.toml

@@ -6,7 +6,7 @@ edition.workspace = true
 
 [dependencies]
 paste = "1.0"
-enumn = "0.1.5"
+enumn = "0.1.8"
 parity-scale-codec = { version = "3.4.0", default-features = false, features = ["derive"] }
 sp-std = { package = "sp-std", git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }
 sp-runtime = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false }