Mark 3.1.47 as released (#20426)

Author: sbc100

ChangeLog.md

@@ -18,8 +18,11 @@ to browse the changes between the tags.
 
 See docs/process.md for more on how version tagging works.
 
-3.1.47 (in development)
+3.1.48 (in development)
 -----------------------
+
+3.1.47 - 10/09/23
+-----------------
 - The boost-headers port was updated to v1.83.0.
 - The `noExitRuntime` global is now a JS library symbol that will only be
   included as needed.  User of `noExitRuntime` will now need to declare a

emscripten-version.txt

@@ -1 +1 @@
-3.1.47-git
+3.1.48-git