Update next MuJoCo version to 3.8.0 for pending breaking changes.

PiperOrigin-RevId: 904496070
Change-Id: I0b8b01cbcf27f28ac80dbc283bc63090f745f403

python/mujoco/CMakeLists.txt

@@ -86,7 +86,7 @@ if(NOT TARGET mujoco)
     if(MUJOCO_FRAMEWORK)
       message("MuJoCo framework is at ${MUJOCO_FRAMEWORK}/mujoco.framework")
       set(MUJOCO_LIBRARY
-          ${MUJOCO_FRAMEWORK}/mujoco.framework/Versions/A/libmujoco.3.7.1.dylib
+          ${MUJOCO_FRAMEWORK}/mujoco.framework/Versions/A/libmujoco.3.8.0.dylib
       )
       target_compile_options(mujoco INTERFACE -F${MUJOCO_FRAMEWORK})
     endif()
@@ -94,7 +94,7 @@ if(NOT TARGET mujoco)
 
   if(NOT MUJOCO_FRAMEWORK)
     find_library(
-      MUJOCO_LIBRARY mujoco mujoco.3.7.1 HINTS ${MUJOCO_LIBRARY_DIR} REQUIRED
+      MUJOCO_LIBRARY mujoco mujoco.3.8.0 HINTS ${MUJOCO_LIBRARY_DIR} REQUIRED
     )
     find_path(MUJOCO_INCLUDE mujoco/mujoco.h HINTS ${MUJOCO_INCLUDE_DIR} REQUIRED)
     message("MuJoCo is at ${MUJOCO_LIBRARY}")