[kstyle] Don't suppress deprecation warnings

Summary:
Depends on D12262
Depends on D12261
Depends on D12260
Depends on D12259
Depends on D12258
Depends on D12257
Depends on D12256

Reviewers: #breeze, hpereiradacosta

Reviewed By: hpereiradacosta

Subscribers: plasma-devel

Tags: #plasma

Maniphest Tasks: T8056

Differential Revision: https://phabricator.kde.org/D12263