chore: remove unused proto imports (#145)

- [ ] 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-networkconnectivity/protos/google/cloud/networkconnectivity/v1/common.proto

@@ -16,7 +16,6 @@ syntax = "proto3";
 
 package google.cloud.networkconnectivity.v1;
 
-import "google/api/annotations.proto";
 import "google/api/field_behavior.proto";
 import "google/protobuf/timestamp.proto";
 

packages/google-cloud-networkconnectivity/protos/google/cloud/networkconnectivity/v1alpha1/common.proto

@@ -18,7 +18,6 @@ package google.cloud.networkconnectivity.v1alpha1;
 
 import "google/api/field_behavior.proto";
 import "google/protobuf/timestamp.proto";
-import "google/api/annotations.proto";
 
 option csharp_namespace = "Google.Cloud.NetworkConnectivity.V1Alpha1";
 option go_package = "google.golang.org/genproto/googleapis/cloud/networkconnectivity/v1alpha1;networkconnectivity";