gh-145177: Upgrade to Emscripten 6.0.3 (#154029)

Author: hoodmane

Platforms/emscripten/config.toml

@@ -1,7 +1,7 @@
 # Any data that can vary between Python versions is to be kept in this file.
 # This allows for blanket copying of the Emscripten build code between supported
 # Python versions.
-emscripten-version = "6.0.2"
+emscripten-version = "6.0.3"
 node-version = "24"
 test-args = [
     "-m", "test",

configure

@@ -2410,8 +2410,6 @@ AS_CASE([$ac_sys_system],
     AS_VAR_APPEND([LINKFORSHARED], [" -sSTACK_SIZE=5MB"])
     dnl Avoid bugs in JS fallback string decoding path
     AS_VAR_APPEND([LINKFORSHARED], [" -sTEXTDECODER=2"])
-    dnl workaround for emscripten#27241, can remove when we update to emscripten 6.0.3
-    AS_VAR_APPEND([LINKFORSHARED], [" -sGROWABLE_ARRAYBUFFERS=0"])
 
     AS_VAR_IF([enable_wasm_dynamic_linking], [yes], [
       AS_VAR_APPEND([LINKFORSHARED], [" -sMAIN_MODULE"])