🐛 fix(postHeader): correct singular display of reading time

Fixed the display logic for reading time in the PostHeader component. The reading time is now correctly displayed in singular form when it is exactly one minute, improving the accuracy of the information shown to the user.

src/components/PostHeader/index.tsx

@@ -100,7 +100,7 @@ export const PostHeader: React.FC = () => {
             /> */}
 
             <GitHubInfo
-              info={`Leitura de aproximadamente ${readingTimeInMinutes} minutos ☕️`}
+              info={`Leitura de aproximadamente ${readingTimeInMinutes} ${readingTimeInMinutes === 1 ? 'minuto' : 'minutos'} ☕️`}
               icon={
                 <TimerIcon
                   size={'1.2rem'}