update chronological order of the React Miami conf (#5977)

Author: M0nica

src/content/community/conferences.md

@@ -10,11 +10,6 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c
 
 ## Upcoming Conferences {/*upcoming-conferences*/}
 
-### React Miami 2023 {/*react-miami-2023*/}
-April 20 - 21, 2023. Miami, FL, USA
-
-[Website](https://www.reactmiami.com/) - [Twitter](https://twitter.com/ReactMiamiConf)
-
 ### Reactathon 2023 {/*reactathon-2023*/}
 May 2 - 3, 2023. San Francisco, CA, USA
 
@@ -92,6 +87,11 @@ December 8 & 12, 2023. In-person in Berlin, Germany + remote first interactivity
 
 ## Past Conferences {/*past-conferences*/}
 
+### React Miami 2023 {/*react-miami-2023*/}
+April 20 - 21, 2023. Miami, FL, USA
+
+[Website](https://www.reactmiami.com/) - [Twitter](https://twitter.com/ReactMiamiConf)
+
 ### React Day Berlin 2022 {/*react-day-berlin-2022*/}
 December 2, 2022. In-person in Berlin, Germany + remote (hybrid event)