Mark 4.0.17 as released (#25578)

Update changelog and emscripten-version.txt [ci skip]

Author: emscripten-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.
 
-4.0.17 (in development)
+4.0.18 (in development)
 -----------------------
+
+4.0.17 - 10/17/25
+-----------------
 - Mutable Wasm globals can now be exported from native code.  Currently these
   cannot be declared in C/C++ but can be defined and exported in assembly code.
   This currently only works for mutable globals since immutables are already

emscripten-version.txt

@@ -1 +1 @@
-4.0.17-git
+4.0.18-git