DDC-2098: [GH-491] remove unused classes

[doctrinebot]

Jira issue originally created by user @beberlei:

This issue is created automatically through a Github pull request on behalf of eventhorizonpl:

Url: #491

Message:

Hi,

This patch removes unused use statements.

Best regards,
Michal

[doctrinebot]

Comment created by @beberlei:

A related Github Pull-Request [GH-491] was closed
#491

[doctrinebot]

Comment created by @FabioBatSilva:

Merged : f5c1b38

[doctrinebot]

Issue was closed with resolution "Fixed"

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-491] was closed:
doctrine/dbal#491