Update openfisca-core requirement from <26,>=25 to >=25,<27
Update openfisca-core requirement from <26,>=25 to >=25,<27

Updates the requirements on [openfisca-core](https://github.com/openfisca/openfisca-core) to permit the latest version.
- [Release notes](https://github.com/openfisca/openfisca-core/releases)
- [Changelog](https://github.com/openfisca/openfisca-core/blob/master/CHANGELOG.md)
- [Commits](https://github.com/openfisca/openfisca-core/compare/25.0...26.0.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
openfisca/openfisca-tunisia,openfisca/openfisca-tunisia