Fix typo: main to master

Author: LimHyungTae

.github/workflows/cpp.yml

@@ -2,9 +2,9 @@ name: C++ API
 
 on:
   push:
-    branches: ["main"]
+    branches: ["master"]
   pull_request:
-    branches: ["main"]
+    branches: ["master"]
 
 env:
   BUILD_TYPE: Release

.github/workflows/python.yml

@@ -1,9 +1,9 @@
 name: Python API
 on:
   push:
-    branches: ["main"]
+    branches: ["master"]
   pull_request:
-    branches: ["main"]
+    branches: ["master"]
 
 jobs:
   python_package: