Adds ext-intl to required extensions

[freshleafmedia]

The ext-intl extension is required to run tests since 111c2e6. Specifically due the to usage of intltz_get_tz_data_version

[stelgenhof]

Thank you @freshleafmedia for this PR. I am aware of this and had not yet added the extension as a requirement since the CI pipeline is failing for the Windows OS. I recall trying to add the extension in the GitHub actions but didn't seem to solve the issue. I left it since, but should look into it again.

[freshleafmedia]

That's odd. The tests were passing before so that must mean that the extension is present. Otherwise an exception would have been thrown 🤔

It's as though Composer doesn't detect it but it is there at runtime? Is it using a different php.ini maybe? Doesn't make any sense to me

[stelgenhof]

What OS are you using locally then? As you can see here in the actions log https://github.com/azuyalabs/yasumi/actions/runs/3854998767/jobs/6569582950#step:8:19 the extension seems to be missing.