fix: use full version with build number for Mendix 10.x in nightly

The Mendix CDN requires 4-segment versions for 10.x downloads
(e.g. mxbuild-10.24.16.96987.tar.gz) while 11.x works with 3 segments.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ako

.github/workflows/nightly.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        mendix-version: ['10.24.16', '11.6.4', '11.8.0']
+        mendix-version: ['10.24.16.96987', '11.6.4', '11.8.0']
       fail-fast: false
     name: test (Mendix ${{ matrix.mendix-version }})
     steps: