fix: Add python version to doc action

Author: AlejandroFernandezLuces

.github/workflows/ci_cd.yml

@@ -77,6 +77,7 @@ jobs:
     - name: "Run Ansys documentation building action"
       uses: ansys/actions/doc-build@v8
       with:
+        python-version: ${{ env.MAIN_PYTHON_VERSION }}
         add-pdf-html-docs-as-assets: true
 
   smoke-tests: