style: use auto with static_cast

[vil02]

Description

In these situations, explicitly describing the type of a defined variable is redundant. I suggest to use auto.

Checklist

• A description of the changes in this PR is mentioned above.
• All the new and existing tests pass.
• The code follows the code style and conventions of the project.
• No plagiarized, duplicated, or repetitive code that has been directly copied from another source.
• I have read the whole Contributing guidelines of the project and its resources/related pages.

Screenshots (if any)

Note to reviewers

Use auto when a variable is defined as a result of static_cast.

[mertcandav]

LGTM. Thanks for your contribution.