remove unicode-ident dependency

Cargo.lock

@@ -715,7 +715,6 @@ dependencies = [
  "syntax",
  "test-utils",
  "text-edit",
- "unicode-ident",
 ]
 
 [[package]]

crates/ide-completion/Cargo.toml

@@ -17,7 +17,6 @@ itertools = "0.10.5"
 
 once_cell = "1.17.0"
 smallvec.workspace = true
-unicode-ident = "1.0.0"
 
 
 # local deps

crates/ide-completion/src/item.rs

@@ -437,8 +437,8 @@ pub(crate) fn build(self, db: &RootDatabase) -> CompletionItem {
                 // `PartialOrd` because it has an alias of ">".
                 .filter(|alias| {
                     let mut chars = alias.chars();
-                    chars.next().is_some_and(unicode_ident::is_xid_start)
-                        && chars.all(unicode_ident::is_xid_continue)
+                    chars.next().is_some_and(char::is_alphabetic)
+                        && chars.all(|c| c.is_alphanumeric() || c == '_')
                 })
                 // Deliberately concatenated without separators as adding separators e.g.
                 // `alias1, alias2` results in LSP clients continuing to display the completion even