build(deps): update pyo3-stub-gen requirement from 0.7.0 to 0.8.0

Updates the requirements on [pyo3-stub-gen](https://github.com/Jij-Inc/pyo3-stub-gen) to permit the latest version.
- [Release notes](https://github.com/Jij-Inc/pyo3-stub-gen/releases)
- [Commits](Jij-Inc/pyo3-stub-gen@0.7.0...0.8.0)

---
updated-dependencies:
- dependency-name: pyo3-stub-gen
  dependency-version: 0.8.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.toml

@@ -33,7 +33,7 @@ pyo3-async-runtimes = { version = "0.24.0", features = [
     "tokio-runtime",
     "unstable-streams",
 ] }
-pyo3-stub-gen = { version = "0.7.0", optional = true }
+pyo3-stub-gen = { version = "0.8.0", optional = true }
 serde = { version = "1.0.219", features = ["derive"] }
 mime = "0.3.17"
 indexmap = { version = "2.8.0", features = ["serde"] }