chore: remove unused proto imports (#62)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 468735472

Source-Link: googleapis/googleapis@cfa1b37

Source-Link: googleapis/googleapis-gen@09b7666
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiMDliNzY2NjY1NjUxMGY1YjAwYjg5M2YwMDNhMGJhNTc2NmY5ZTI1MCJ9

Author: gcf-owl-bot[bot]

packages/google-cloud-orchestration-airflow-service/protos/google/cloud/orchestration/airflow/service/v1/operations.proto

@@ -17,7 +17,6 @@ syntax = "proto3";
 package google.cloud.orchestration.airflow.service.v1;
 
 import "google/protobuf/timestamp.proto";
-import "google/api/annotations.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/orchestration/airflow/service/v1;service";
 option java_multiple_files = true;

packages/google-cloud-orchestration-airflow-service/protos/google/cloud/orchestration/airflow/service/v1beta1/operations.proto

@@ -17,7 +17,6 @@ syntax = "proto3";
 package google.cloud.orchestration.airflow.service.v1beta1;
 
 import "google/protobuf/timestamp.proto";
-import "google/api/annotations.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/cloud/orchestration/airflow/service/v1beta1;service";
 option java_multiple_files = true;