chore(core): hide phf, closes #1961 (#1964)

.changes/hide-phf.md

@@ -0,0 +1,6 @@
+---
+"tauri-utils": patch
+"tauri": patch
+---
+
+Hide `phf` crate export (not public API).

core/tauri-utils/src/assets.rs

@@ -4,6 +4,7 @@
 
 //! Assets handled by Tauri during compile time and runtime.
 
+#[doc(hidden)]
 pub use phf;
 use std::{
   borrow::Cow,