Update composer.json to phalcon 5+ and migrations 3+

[fvromera]

Hello!

• Type: bug fix | new feature | code quality | documentation
• Link to issue:

In raising this pull request, I confirm the following (please check boxes):

• [x] I have read and understood the Contributing Guidelines
• [x] I have checked that another pull request for this purpose does not exist
• [ ] I wrote some tests for this PR

Small description of change:

Changed phalcon extension 5+ and devtools 3+ required

Thanks

[rudiservo]

@fvromera Change the PR to 5.0.x instead of master branch please.