[Github] Add compiler-rt:scudo label to scudo prs (#66829)

Author: ChiaHungDuan

.github/new-prs-labeler.yml

@@ -90,6 +90,10 @@ compiler-rt:sanitizer:
   - compiler-rt/lib/scudo/**
   - compiler-rt/test/scudo/**
 
+compiler-rt:scudo:
+  - compiler-rt/lib/scudo/**
+  - compiler-rt/test/scudo/**
+
 xray:
   - llvm/tools/llvm-xray/**
   - compiler-rt/*/xray/**