Update MSRV to 1.85 and toolchain to 1.87 (#18126)

crates/ty_python_semantic/src/site_packages.rs

@@ -594,7 +594,7 @@ impl PythonHomePath {
         system
             .is_directory(&canonicalized)
             .then_some(Self(canonicalized))
-            .ok_or_else(|| io::Error::new(io::ErrorKind::Other, "not a directory"))
+            .ok_or_else(|| io::Error::other("not a directory"))
     }
 }
 

crates/ty_python_semantic/src/types.rs

@@ -5034,7 +5034,6 @@ impl<'db> Type<'db> {
     /// Note that this does not specialize generic classes, functions, or type aliases! That is a
     /// different operation that is performed explicitly (via a subscript operation), or implicitly
     /// via a call to the generic object.
-    #[must_use]
     #[salsa::tracked]
     pub fn apply_specialization(
         self,