Update GitHub actions (#32)

Author: AnHeuermann

.github/workflows/test.yml

@@ -15,10 +15,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup npm
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 20
           registry-url: https://registry.npmjs.org/
@@ -47,7 +47,7 @@ jobs:
         run: npx vsce package
 
       - name: Archive vsix package
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: modelica-language-server.vsix
           path: modelica-language-server-*.vsix
@@ -59,7 +59,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v8
         with:
           name: modelica-language-server.vsix