Mark 3.1.66 as released (emscripten-core#22549)

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Co-authored-by: emscripten-bot <[email protected]>

Author: github-actions[bot]

ChangeLog.md

@@ -18,8 +18,11 @@ to browse the changes between the tags.
 
 See docs/process.md for more on how version tagging works.
 
-3.1.66 (in development)
+3.1.67 (in development)
 -----------------------
+
+3.1.66 - 09/10/24
+-----------------
 - The behaviour of the `pthread_kill` function was fixed to match the spec
   and will now run the designated handler on the target thread. (#22467)
 - Added support for WebGL extensions EXT_clip_control, EXT_depth_clamp,

emscripten-version.txt

@@ -1 +1 @@
-3.1.66-git
+3.1.67-git