Add deprecation of broadcast_zpreserving to NEWS.md. [ci skip]

NEWS.md

@@ -364,6 +364,8 @@ Deprecated or removed
 
   * `isimag` has been deprecated ([#19949]).
 
+  * `broadcast_zpreserving` has been deprecated ([#19533],[#19720]).
+
 <!--- generated by NEWS-update.jl: -->
 [#265]: https://github.com/JuliaLang/julia/issues/265
 [#4615]: https://github.com/JuliaLang/julia/issues/4615
@@ -413,6 +415,7 @@ Deprecated or removed
 [#19449]: https://github.com/JuliaLang/julia/issues/19449
 [#19464]: https://github.com/JuliaLang/julia/issues/19464
 [#19469]: https://github.com/JuliaLang/julia/issues/19469
+[#19533]: https://github.com/JuliaLang/julia/issues/19533
 [#19543]: https://github.com/JuliaLang/julia/issues/19543
 [#19598]: https://github.com/JuliaLang/julia/issues/19598
 [#19635]: https://github.com/JuliaLang/julia/issues/19635
@@ -422,6 +425,7 @@ Deprecated or removed
 [#19692]: https://github.com/JuliaLang/julia/issues/19692
 [#19711]: https://github.com/JuliaLang/julia/issues/19711
 [#19712]: https://github.com/JuliaLang/julia/issues/19712
+[#19720]: https://github.com/JuliaLang/julia/issues/19720
 [#19721]: https://github.com/JuliaLang/julia/issues/19721
 [#19722]: https://github.com/JuliaLang/julia/issues/19722
 [#19741]: https://github.com/JuliaLang/julia/issues/19741