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/y2023_bot4/swerve_publisher_lib_test.cc b/y2023_bot4/swerve_publisher_lib_test.cc
index 817f295..e834659 100644
--- a/y2023_bot4/swerve_publisher_lib_test.cc
+++ b/y2023_bot4/swerve_publisher_lib_test.cc
@@ -4,8 +4,7 @@
 
 #include "aos/events/simulated_event_loop.h"
 
-namespace y2023_bot4 {
-namespace testing {
+namespace y2023_bot4::testing {
 class SwervePublisherTest : public ::testing::Test {
  public:
   SwervePublisherTest()
@@ -50,5 +49,4 @@
   SendOutput();
   CheckOutput();
 }
-}  // namespace testing
-}  // namespace y2023_bot4
+}  // namespace y2023_bot4::testing