🔒 pin build_documentation.yml actions to commit SHAs

Author: paulinebm

.github/workflows/build_documentation.yml

@@ -9,7 +9,7 @@ on:
 
 jobs:
    build:
-    uses: huggingface/doc-builder/.github/workflows/build_main_documentation.yml@main
+    uses: huggingface/doc-builder/.github/workflows/build_main_documentation.yml@90b4ee2c10b81b5c1a6367c4e6fc9e2fb510a7e3  # main
     with:
       commit_sha: ${{ github.sha }}
       package: evaluate