min php version fix

[fballiano]

Just a small update for the minimum PHP version and the link to the documentation

Description (*)

as written here: https://devdocs.magento.com/guides/v2.3/install-gde/system-requirements-tech.html the min php version is 7.1.3 but the check in this file was wrong (so also the error messages)

Fixed Issues (if relevant)

1. wrong php version in app/bootstrap.php #19453

Manual testing scenarios (*)

1. try to run M2.3 on php5.5
2. the system tells you you should have php 7.0.something, which is wrong (as from https://devdocs.magento.com/guides/v2.3/install-gde/system-requirements-tech.html)
3. with this fix the minimum php version is checked correctly and the error message is also consistent

[magento-engcom-team]

Hi @fballiano. Thank you for your contribution
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[magento-cicd2]

All committers have signed the CLA.

[magento-engcom-team]

Hi @orlangur, thank you for the review.
ENGCOM-3589 has been created to process this Pull Request

[magento-engcom-team]

@fballiano thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[orlangur]

@magento-engcom-team please include this in 2.3.0 release if possible.

Also, would be nice to add this to some release activity checklist or a "bump minimum required version" doc as in 2.2 bootstrap became out of sync as well: https://github.com/magento/magento2/blob/2.2-develop/composer.json#L11

[orlangur]

Ok, nevermind, 2.3.0 is already released 🤣

[magento-engcom-team]

Hi @fballiano. Thank you for your contribution.
We will aim to release these changes as part of 2.3.1.
Please check the release notes for final confirmation.