chore: update CODEOWNERS (#122)

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Author: awf-autoware-bot[bot]

.github/CODEOWNERS

@@ -1,4 +1,6 @@
 ### Automatically generated from package.xml ###
 common/autoware_geography_utils/** anh.nguyen.2@tier4.jp masahiro.sakamoto@tier4.jp ryu.yamamoto@tier4.jp shintaro.sakoda@tier4.jp taiki.yamada@tier4.jp yamato.ando@tier4.jp @autowarefoundation/autoware-core-global-codeowners
+common/autoware_node/** mfc@autoware.org @autowarefoundation/autoware-core-global-codeowners
+demos/autoware_test_node/** mfc@autoware.org @autowarefoundation/autoware-core-global-codeowners
 
 ### Copied from .github/CODEOWNERS-manual ###