Update team name

Author: openminddev

.github/CODEOWNERS

@@ -2,11 +2,11 @@
 * @OpenMind/core-developer-team
 
 # OM Code Reviewer Rules
-*.mdx @OpenMind/devrel-team @OpenMind/admin
-*.md @OpenMind/devrel-team @OpenMind/admin
-/docs/ @OpenMind/devrel-team @OpenMind/admin
-/config/ @OpenMind/core-developer-team @OpenMind/admin
-/src/ @OpenMind/robotics-team @OpenMind/admin
-/gazebo/ @OpenMind/robotics-team @OpenMind/admin
-/system_hw_test/ @OpenMind/robotics-team @OpenMind/admin
-/.github/ @OpenMind/admin
+*.mdx @OpenMind/devrel-team @OpenMind/openmind-core
+*.md @OpenMind/devrel-team @OpenMind/openmind-core
+/docs/ @OpenMind/devrel-team @OpenMind/openmind-core
+/config/ @OpenMind/core-developer-team @OpenMind/openmind-core
+/src/ @OpenMind/robotics-team @OpenMind/openmind-core
+/gazebo/ @OpenMind/robotics-team @OpenMind/openmind-core
+/system_hw_test/ @OpenMind/robotics-team @OpenMind/openmind-core
+/.github/ @OpenMind/openmind-core