Update codeowner (sgl-project#8476)

Author: merrymercy

.github/CODEOWNERS

@@ -1,8 +1,9 @@
-/3rdparty/amd @HaiShaw
+# All files
+* @sgl-project/sgl-codeowner
+
+# Individual folders
 /docker @zhyncs @HaiShaw @ByronHsu
 /docs @zhaochenyang20
-/python/sglang/lang @merrymercy @Ying1123 @hnyls2002
-/python/sglang/srt @merrymercy @Ying1123 @hnyls2002 @zhyncs @ispobock @ByronHsu
 /python/sglang/srt/constrained @hnyls2002
 /python/sglang/srt/disaggregation @ByronHsu @hnyls2002
 /python/sglang/srt/distributed @yizhang2077
@@ -14,11 +15,7 @@
 /python/sglang/srt/managers @merrymercy @Ying1123 @hnyls2002 @xiezhq-hermann
 /python/sglang/srt/mem_cache @merrymercy @Ying1123 @hnyls2002 @xiezhq-hermann
 /python/sglang/srt/model_executor @merrymercy @Ying1123 @hnyls2002 @zhyncs @ispobock
-/python/sglang/srt/models @zhyncs @ispobock @ByronHsu @JustinTong0323
 /python/sglang/srt/multimodal @mickqian @JustinTong0323
-/python/sglang/srt/sampling @hnyls2002
 /python/sglang/srt/speculative @Ying1123 @merrymercy @rkooo567 @kssteven418
-/test/lang @merrymercy @Ying1123
-/test/srt @merrymercy @Ying1123 @zhyncs
 /sgl-router @ByronHsu @slin1237
 /sgl-kernel @zhyncs @ispobock @HandH1998 @BBuf @yizhang2077 @merrymercy @FlamingoPg @HaiShaw