Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/y2023/autonomous/auto_splines.h b/y2023/autonomous/auto_splines.h
index 6921e64..13c24c0 100644
--- a/y2023/autonomous/auto_splines.h
+++ b/y2023/autonomous/auto_splines.h
@@ -13,8 +13,7 @@
 
 */
 
-namespace y2023 {
-namespace autonomous {
+namespace y2023::autonomous {
 
 class AutonomousSplines {
  public:
@@ -95,7 +94,6 @@
   aos::FlatbufferDetachedBuffer<frc971::MultiSpline> splinecable_4_;
 };
 
-}  // namespace autonomous
-}  // namespace y2023
+}  // namespace y2023::autonomous
 
 #endif  // Y2023_AUTONOMOUS_AUTO_SPLINES_H_