[SYCL][E2E] Fix includes in regression/tanh_complex (#20881)

Signed-off-by: Larsen, Steffen <[email protected]>

Author: steffenlarsen

sycl/test/regression/tanh_complex.cpp

@@ -9,6 +9,8 @@
 #include <sycl/sycl.hpp>
 
 #include <complex>
+#include <iomanip>
+#include <iostream>
 #include <limits>
 
 namespace syclexp = sycl::ext::oneapi::experimental;