No newlines between trait uses

Because types are not specified in docblocks but directly in code, which is even more true with PHP 8 and union types.

Because

class Waldo
{

    use Something;

    use SomethingElse;

    private Foo $foo;
    private Bar $bar;

}

looks better when written like

class Waldo
{

    use Something;
    use SomethingElse;

    private Foo $foo;
    private Bar $bar;

}