Fixed labeler. (#8)

.github/workflows/dev_pr/labeler.yml

@@ -15,54 +15,11 @@
 # specific language governing permissions and limitations
 # under the License.
 
-"lang-c++":
-  - cpp/**/*
+arrow:
+  - arrow/**/*
 
-lang-c-glib:
-  - c_glib/**/*
-
-lang-csharp:
-  - csharp/**/*
-
-lang-go:
-  - go/**/*
-
-lang-java:
-  - java/**/*
-
-lang-js:
-  - js/**/*
-
-lang-julia:
-  - julia/**/*
-
-lang-python:
-  - python/**/*
-
-lang-R:
-  - r/**/*
-
-lang-ruby:
-  - ruby/**/*
-
-lang-rust:
-  - rust/**/*
-
-flight:
-  - cpp/src/arrow/flight/**/*
-  - r/R/flight.*
-  - rust/arrow-flight/**/*
-  - python/pyarrow/*flight.*
-
-gandiva:
-  - c_glib/gandiva-glib/**/*
-  - cpp/src/gandiva/**/*
-  - ruby/red-gandiva/**/*
-  - python/pyarrow/gandiva.*
+arrow-flight:
+  - arrow-flight/**/*
 
 parquet:
-  - c_glib/parquet-glib/**/*
-  - cpp/src/parquet/**/*
-  - r/R/parquet.*
-  - ruby/red-parquet/**/*
-  - rust/parquet*/**/*
+  - parquet/**/*