Update actions.yml

.github/workflows/actions.yml

@@ -1,22 +1,30 @@
 name: learning-cocotb
 run-name: ${{ github.actor }} is learning Cocotb
-on: 
+on:
   workflow_dispatch:
+
 jobs:
   verify:
     runs-on: ubuntu-latest
     timeout-minutes: 3
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@v3
+
       - run: sudo apt install -y --no-install-recommends iverilog
+
       - run: pip3 install cocotb cocotb-bus
+
       - run: make -C tests or
-      - uses: actions/upload-artifact@v3
+
+      - uses: actions/upload-artifact@v4
         with:
           name: waveform
           path: tests/*.vcd
+
       - name: Publish Test Report
         uses: mikepenz/action-junit-report@v3
-        if: always() # always run even if the previous step fails
+        if: always()
         with:
           report_paths: '**/tests/results.xml'