Fix empty site.version — use inputs.version directly

The DEPLOY_VERSION env var was removed with the old validation step.
Use inputs.version directly since it's already the bare version string.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: edburns

.github/workflows/deploy-site.yml

@@ -84,7 +84,7 @@ jobs:
       - name: Build documentation site
         run: |
           echo "Building site for version ${{ env.DEPLOY_VERSION }}"
-          mvn site -Dsite.version=${{ env.DEPLOY_VERSION }} -B
+          mvn site -Dsite.version=${{ inputs.version }} -B
 
       # 6. Checkout gh-pages branch from this (standalone) repo
       - name: Checkout gh-pages branch