Nest all namespaces

The compiler supports this now.  We can type less going forward.
No functional changes.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I29d6fa4f9aacc0e381f1a7637294db0392466995
diff --git a/y2022/wpilib_interface.cc b/y2022/wpilib_interface.cc
index 55cf510..dd2224c 100644
--- a/y2022/wpilib_interface.cc
+++ b/y2022/wpilib_interface.cc
@@ -65,8 +65,7 @@
 
 DEFINE_bool(can_catapult, false, "If true, use CAN to control the catapult.");
 
-namespace y2022 {
-namespace wpilib {
+namespace y2022::wpilib {
 namespace {
 
 constexpr double kMaxBringupPower = 12.0;
@@ -828,7 +827,6 @@
   }
 };
 
-}  // namespace wpilib
-}  // namespace y2022
+}  // namespace y2022::wpilib
 
 AOS_ROBOT_CLASS(::y2022::wpilib::WPILibRobot);