Update Rust crate handlebars to v6 (#1360)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Cargo.lock

@@ -7,7 +7,7 @@ edition = "2021"
 [dependencies]
 color-eyre = "=0.6.3"
 eyre = "=0.6.12"
-handlebars = { version = "=5.1.2", features = ["dir_source"] }
+handlebars = { version = "=6.0.0", features = ["dir_source"] }
 lazy_static = "=1.5.0"
 serde = "=1.0.204"
 serde_derive = "=1.0.204"