Update TensorKitManifolds requirement 0.8 (#421)

Updates the requirements on [TensorKitManifolds](https://github.com/QuantumKitHub/TensorKitManifolds.jl) to permit the latest version.

Updates `TensorKitManifolds` to 0.8.0
- [Release notes](https://github.com/QuantumKitHub/TensorKitManifolds.jl/releases)
- [Commits](QuantumKitHub/TensorKitManifolds.jl@v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: TensorKitManifolds
  dependency-version: 0.8.0
  dependency-type: direct:production
  dependency-group: all-julia-packages
...

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Author: dependabot[bot]

Project.toml

@@ -49,7 +49,7 @@ Printf = "1"
 Random = "1"
 RecipesBase = "1.1"
 TensorKit = "0.16.5"
-TensorKitManifolds = "0.7"
+TensorKitManifolds = "0.7, 0.8"
 TensorOperations = "5.5.1"
 VectorInterface = "0.2, 0.3, 0.4, 0.5"
 julia = "1.10"