build-tests: upgrade stylish-core to fix build-test

Author: syphar

src/docbuilder/rustwide_builder.rs

@@ -1980,7 +1980,7 @@ mod tests {
     fn test_no_implicit_features_for_optional_dependencies_with_dep_syntax() {
         wrapper(|env| {
             let crate_ = "stylish-core";
-            let version = "0.1.1";
+            let version = "0.1.2";
             let mut builder = RustwideBuilder::init(env).unwrap();
             builder.update_toolchain()?;
             assert!(