Update NEWS.md

Author: DhairyaLGandhi

NEWS.md

@@ -7,6 +7,7 @@
 * Added option to set `bias` to [false](https://github.com/FluxML/Flux.jl/pull/1379) to eliminating `bias` from being trained.
 * Removed kwarg only constructors for [`convolutional layers`](https://github.com/FluxML/Flux.jl/pull/1379)).
 * Add [sparse initialization](https://github.com/FluxML/Flux.jl/pull/1454) as described in [Deep learning via Hessian-free optimization](https://dl.acm.org/doi/abs/10.5555/3104322.3104416).
+* Moved GPU CI to use buildkite instead of GitLab
 * Other new features and bug fixes (see GitHub releases page)
 
 ## v0.11.2