Document constructor injection support in release notes

Resolves #4018.

Author: marcphilipp

documentation/src/docs/asciidoc/release-notes/release-notes-5.12.0-M1.adoc

@@ -50,6 +50,10 @@ JUnit repository on GitHub.
 * In a `@ParameterizedTest` method, a `null` value can now be supplied for Java Date/Time
   types such as `LocalDate` if the new `nullable` attribute in
   `@JavaTimeConversionPattern` is set to `true`.
+* `ArgumentsProvider` (declared via `@ArgumentsSource`), `ArgumentConverter` (declared via
+  `@ConvertWith`), and `ArgumentsAggregator` (declared via `@AggregateWith`)
+  implementations can now use constructor injection from registered `ParameterResolver`
+  extensions.
 
 
 [[release-notes-5.12.0-M1-junit-vintage]]