mvn versions:set warns duplicate dependencies declaration #5536
Description
(Because usually I don't need to run "mvn versions:set", this is not blocking me)
Environment details
Git HEAD
Steps to reproduce
Run mvn versions:set -DnextSnapshot=true -B at root directory
Code example
N/A
Stack trace
suztomo@suxtomo24:~/google-cloud-java/google-cloud-clients$ mvn versions:set -DnextSnapshot=true -B
[INFO] Scanning for projects...
[INFO] Downloading from google-maven-central: https://maven-central.storage-download.googleapis.com/repos/central/data/com/google/cloud/google-cloud-bom/0.97.0-alpha/google-cloud-bom-0.97.0-alpha.pom
[INFO] Downloaded from google-maven-central: https://maven-central.storage-download.googleapis.com/repos/central/data/com/google/cloud/google-cloud-bom/0.97.0-alpha/google-cloud-bom-0.97.0-alpha.pom (56 kB at 141 kB/s)
[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.google.cloud:google-cloud-bigquerystorage:jar:0.97.0-beta
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: com.google.api:gax:jar -> duplicate declaration of version (?) @ line 88, column 21
[WARNING] 'dependencies.dependency.(groupId:artifactId:type:classifier)' must be unique: com.google.api:gax-grpc:jar -> duplicate declaration of version (?) @ line 92, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
External references such as API reference guides used
google-cloud-clients/google-cloud-bigquerystorage/pom.xml
