remove unused dependency

Author: kalleep

go.mod

@@ -305,7 +305,6 @@ require (
 	google.golang.org/api v0.254.0
 	google.golang.org/grpc v1.76.0
 	google.golang.org/protobuf v1.36.10
-	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7
 	gopkg.in/yaml.v2 v2.4.0
 	gopkg.in/yaml.v3 v3.0.1
 	gotest.tools v2.2.0+incompatible