Auto merge of #14772 - hcbarker:issue-14764-fix, r=weihanglo

chore: update handlebars to v6, fix build error

`DirectorySourceOptions` is marked as `#[non_exhaustive]`, and only exposes the Default trait, so we need to instantiate a mutable instance using `default()`, and then change `tpl_extension` to the value we want.

Fixes #14764

Cargo.toml

@@ -50,7 +50,7 @@ git2 = "0.19.0"
 git2-curl = "0.20.0"
 gix = { version = "0.67.0", default-features = false, features = ["blocking-http-transport-curl", "progress-tree", "parallel", "dirwalk"] }
 glob = "0.3.1"
-handlebars = { version = "5.1.2", features = ["dir_source"] }
+handlebars = { version = "6.0.0", features = ["dir_source"] }
 hex = "0.4.3"
 hmac = "0.12.1"
 home = "0.5.9"

crates/mdman/src/hbs.rs

@@ -24,11 +24,8 @@ pub fn expand(file: &Path, formatter: FormatterRef<'_>) -> Result<String, Error>
     handlebars.register_decorator("set", Box::new(set_decorator));
     handlebars.register_template_file("template", file)?;
     let includes = file.parent().unwrap().join("includes");
-    let options = DirectorySourceOptions {
-        tpl_extension: ".md".to_string(),
-        hidden: false,
-        temporary: false,
-    };
+    let mut options = DirectorySourceOptions::default();
+    options.tpl_extension = ".md".to_string();
     handlebars.register_templates_directory(includes, options)?;
     let man_name = file
         .file_stem()