Updated Jitpack URL in android template to fix gradle errors

[AndrewBastin]

Summary

Running react-native run-android fails for me with the error saying connection timed out for fetching a library from jitpack. This seems to be a well known issue mentioned around. The issue is resolved by updating the url from https://jitpack.io to https://www.jitpack.io .

Changelog

[Android] [Fixed] - Updated template/android/build.gradle with a modified jitpack URL

Test Plan

1. Create a new react-native app with react-native init <app-name>
2. Run react-native run-android
3. App runs without modifications!

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[cpojer]

Thank you!

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@cpojer is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @AndrewBastin in 018b748.

^{When will my fix make it into a release? | Upcoming Releases}

[sonicdoe]

I’ve stumbled over this pull request when upgrading React Native to v0.62. If anyone’s curious, there’s an open issue over at jitpack/jitpack.io#4002 and Expo made the same change with expo/expo#5892.