Update AtUri import to use official package with fix for usernames that start with numbers (close #414) (#418)

src/view/com/posts/FeedItem.tsx

@@ -2,7 +2,7 @@ import React, {useMemo, useState} from 'react'
 import {observer} from 'mobx-react-lite'
 import {Linking, StyleSheet, View} from 'react-native'
 import Clipboard from '@react-native-clipboard/clipboard'
-import {AtUri} from '../../../third-party/uri'
+import {AtUri} from '@atproto/api'
 import {
   FontAwesomeIcon,
   FontAwesomeIconStyle,

src/view/com/posts/FeedSlice.tsx

@@ -1,7 +1,7 @@
 import React from 'react'
 import {StyleSheet, View} from 'react-native'
 import {PostsFeedSliceModel} from 'state/models/feeds/posts'
-import {AtUri} from '../../../third-party/uri'
+import {AtUri} from '@atproto/api'
 import {Link} from '../util/Link'
 import {Text} from '../util/text/Text'
 import Svg, {Circle, Line} from 'react-native-svg'