Bump Intl version to 0.19.0

[jja08111]

[Hesham-Dev-LY]

I have a problem related to the same issue, where I can no longer use some packages .

Note: intl is pinned to version 0.19.0 by flutter_localizations from the flutter SDK.
See https://dart.dev/go/sdk-version-pinning for details.
Because no versions of time_chart match >0.5.5 <0.6.0 and time_chart 0.5.5 depends on intl ^0.18.0, time_chart ^0.5.5 requires intl ^0.18.0.
And because every version of flutter_localizations from sdk depends on intl 0.19.0, time_chart ^0.5.5 is incompatible with flutter_localizations from sdk.
So, because (MyApp) depends on both flutter_localizations from sdk and time_chart ^0.5.5, version solving failed.

I hope to solve this simple problem, I can help if you are interested