Bump actions to nodejs20

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     name: 'Build the die-koma.org website'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v9
         with:
           nix-installer-tag: v0.15.1
@@ -21,7 +21,7 @@ jobs:
         run: echo "name=BRANCH_NAME::${BRANCH_NAME_OR_REF#refs/heads/}" >> $GITHUB_ENV
       - run: echo "name=PR_NUMBER::$(jq --raw-output .pull_request.number "$GITHUB_EVENT_PATH")" >> $GITHUB_ENV
       - run: nix --print-build-logs build .#KoMaHomepageTar -o homepage.tar.xz
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: build-artifacts
           path: homepage.tar.xz
@@ -30,7 +30,7 @@ jobs:
     name: 'Check for broken links'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v9
         with:
           nix-installer-tag: v0.15.1
@@ -53,10 +53,10 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: release
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: build-artifacts
       - run: rm -rf homepage