Add missing include to <mutex>

[Tobias-Fischer]

In file included from $SRC_DIR/ros-humble-slam-toolbox/src/work/lib/karto_sdk/src/Karto.cpp:27: $SRC_DIR/ros-humble-slam-toolbox/src/work/lib/karto_sdk/include/karto_sdk/Karto.h: In member function 'const karto::Pose2& karto::LocalizedRangeScan::GetBarycenterPose() const': $SRC_DIR/ros-humble-slam-toolbox/src/work/lib/karto_sdk/include/karto_sdk/Karto.h:5503:12: error: 'unique_lock' is not a member of 'std'
 5503 |       std::unique_lock<std::shared_mutex> uniqueLock(m_Lock);
      |            ^~~~~~~~~~~

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Ticket(s) this addresses	(add tickets here #1)
Primary OS tested on	(Ubuntu, MacOS, Windows)
Robotic platform tested on	(Steve's Robot, gazebo simulation of Tally, hardware turtlebot)

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[SteveMacenski]

@Tobias-Fischer please open against ros2 as well so that all future distributions will have it reflected as well! Then I'll merge the pair