Update labeller for new crates (#3639)

Author: tustvold

.github/workflows/dev_pr/labeler.yml

@@ -16,13 +16,19 @@
 # under the License.
 
 arrow:
+  - arrow-arith/**/*
   - arrow-array/**/*
   - arrow-buffer/**/*
   - arrow-cast/**/*
   - arrow-csv/**/*
   - arrow-data/**/*
+  - arrow-flight/**/*
+  - arrow-integration-test/**/*
+  - arrow-integration-testing/**/*
   - arrow-ipc/**/*
   - arrow-json/**/*
+  - arrow-ord/**/*
+  - arrow-row/**/*
   - arrow-schema/**/*
   - arrow-select/**/*
   - arrow-string/**/*