Update gvdb requirement from 0.5.1 to 0.6.1

Updates the requirements on [gvdb](https://github.com/felinira/gvdb-rs) to permit the latest version.
- [Release notes](https://github.com/felinira/gvdb-rs/releases)
- [Changelog](https://github.com/felinira/gvdb-rs/blob/main/CHANGELOG.md)
- [Commits](felinira/gvdb-rs@gvdb-0.5.1...gvdb-0.6.1)

---
updated-dependencies:
- dependency-name: gvdb
  dependency-type: direct:production
...

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

Cargo.toml

@@ -23,7 +23,7 @@ members = [
 gtk = { version = "0.8", package = "gtk4" }
 
 [build-dependencies]
-gvdb = { version = "0.5.3", features = ["gresource"] }
+gvdb = { version = "0.6.1", features = ["gresource"] }
 serde = { version = "1.0.197", features = ["derive"] }
 toml = "0.8.11"