Remove boto3 as dev dependency
After the merge of #1418, `boto3` is no longer necessary as a dev dependency in ~~rows and~~ search services.

Note that the dependency on `boto3` is indirectly set by the dependency on `libcommon`.
Remove boto3 as dev dependency: After the merge of #1418, `boto3` is no longer necessary as a dev dependency in ~~rows and~~ search services.

Note that the dependency on `boto3` is indirectly set by the dependency on `libcommon`.