nix: update to rust-1.66

Rust 1.66.0 was announced[0].

The code fixes were all for the clippy warning regarding needless
borrows.

The doc tool now parses for HTML, so any <placeholder> now needs to
be wrapped in backticks, i.e. `<placeholder>`.

[0]: https://blog.rust-lang.org/2022/12/15/Rust-1.66.0.html

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

git-ref-format/core/src/deriv.rs

@@ -96,7 +96,7 @@ impl<'a> Qualified<'a> {
     /// Add a namespace.
     ///
     /// Creates a new [`Namespaced`] by prefxing `self` with
-    /// "refs/namespaces/<ns>".
+    /// `refs/namespaces/<ns>`.
     pub fn with_namespace<'b>(&self, ns: Component<'b>) -> Namespaced<'a> {
         Namespaced(Cow::Owned(
             IntoIterator::into_iter([lit::Refs.into(), lit::Namespaces.into(), ns])

git-ref-format/core/src/refspec.rs

@@ -345,7 +345,7 @@ impl<'a> QualifiedPattern<'a> {
     /// Add a namespace.
     ///
     /// Creates a new [`NamespacedPattern`] by prefxing `self` with
-    /// "refs/namespaces/<ns>".
+    /// `refs/namespaces/<ns>`.
     pub fn with_namespace<'b>(
         &self,
         ns: Component<'b>,