Description of Change

This PR removes some unused includes of the vector header. Such shell script was useful to identify the files needing an update:

#!/bin/bash

find . -type f \( -name "*.cpp" -o -name "*.hpp" \) | while read -r file; do
    if grep -q '<vector>' "$file" && ! grep -q 'vector<' "$file"; then
        echo "$file"
    fi
done

Checklist

• Added description of change
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate.
• I acknowledge that all my contributions will be made under the project's license.

Notes:
Removed unused vector includes.