docs: add Angular 19 to Version compatibility table (#1462)

Author: timdeschryver

docs/angular-testing-library/version-compatibility.mdx

@@ -8,6 +8,7 @@ Library and Angular.
 
 | Angular | Angular Testing Library      |
 | ------- | ---------------------------- |
+| 19.x    | 17.x, 16.x, 15.x, 14.x, 13.x |
 | 18.x    | 17.x, 16.x, 15.x, 14.x, 13.x |
 | 17.x    | 17.x, 16.x, 15.x, 14.x, 13.x |
 | 16.x    | 14.x, 13.x                   |