deps: update handlebars requirement from 5.0.0 to 6.1.0

Updates the requirements on [handlebars](https://github.com/sunng87/handlebars-rust) to permit the latest version.
- [Release notes](https://github.com/sunng87/handlebars-rust/releases)
- [Changelog](https://github.com/sunng87/handlebars-rust/blob/master/CHANGELOG.md)
- [Commits](sunng87/handlebars-rust@v5.0.0...v6.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

handlebars/Cargo.toml

@@ -12,7 +12,7 @@ categories = ["web-programming::http-server", "web-programming"]
 
 [dependencies]
 glob = "0.3.1"
-handlebars = { version = "5.0.0", features = ["dir_source"] }
+handlebars = { version = "6.1.0", features = ["dir_source"] }
 log = "0.4.20"
 serde = { version = "1.0.193", features = ["derive"] }
 serde_json = "1.0.108"