ci(native-pipeline): drop unused mendix_version input from setup-tools

setup-tools no longer references mendix_version (the runtime-tarball + m2ee caches
that consumed it were removed when the portable app package replaced the
hand-rolled runtime). Remove the input declaration and the 4 call-site with: lines.

Author: vadim-v

.github/actions/setup-tools/action.yaml

@@ -1,9 +1,5 @@
 name: "Setup Tools"
 description: "Common setup for widget and js test jobs"
-inputs:
-  mendix_version:
-    description: "Mendix version"
-    required: true
 outputs:
   java-path:
     description: "Path to the installed Java"