unified names

.github/workflows/neocities.yml

@@ -21,7 +21,7 @@ jobs:
   setup:
     runs-on: ubuntu-latest 
     outputs: 
-      matrix: ${{ steps.matrix.outputs.value }}
+      matrix: ${{ steps.matrix.outputs.matrix }}
     steps:
       - uses: actions/checkout@v4
       - name: create matrix
@@ -30,7 +30,7 @@ jobs:
           cd ${{ github.workspace }}
           echo "<ul class=posts>" > public/posts.html 
           test=$(./compile.sh)
-          echo "::set-output name=matrix::$test"
+          echo "matrix=$test" >> $GITHUB_OUTPUT
       - name: check matrix
         run: |
           echo "${{ steps.matrix.outputs.value }}"