fix docs deploy

Author: ValentinH

.github/workflows/github-pages.yml

@@ -21,7 +21,7 @@ jobs:
       # setup cache
       - name: Get yarn cache directory path
         id: yarn-cache-dir-path
-        run: echo "::set-output name=dir::$(yarn cache dir)"
+        run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
       - uses: actions/cache@v4
         id: yarn-cache
         with: