minor #14529 Use integer type instead of int & boolean instead of bool (ybenhssaien)

This PR was squashed before being merged into the 5.1 branch.

Discussion
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Use integer type instead of int & boolean instead of bool

Uses the same type hint `int` already used in the `optimizations` config

# Update
- [x] Replace `int` by `integer`
- [x] Replace `bool` by `boolean`

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Commits
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df76829 Use integer type instead of int & boolean instead of bool

Author: OskarStark