ci: doc: upgrade actions

So that deprecated features are no longer used.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

.github/workflows/docbuild.yml

@@ -36,7 +36,7 @@ jobs:
         uses: nrfconnect/action-checkout-west-update@main
 
       - name: cache-pip
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ~/.cache/pip
           key: ${{ runner.os }}-doc-pip
@@ -108,7 +108,7 @@ jobs:
 
       - name: Store
         if: ${{ !contains(github.event.pull_request.labels.*.name, 'external') || contains(github.event.pull_request.labels.*.name, 'CI-trusted-author') }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: docs
           path: |

.github/workflows/docpublish.yml

@@ -12,7 +12,7 @@ jobs:
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
       - name: Download artifacts
-        uses: dawidd6/action-download-artifact@v2
+        uses: dawidd6/action-download-artifact@v6
         with:
           workflow: docbuild.yml
           run_id: ${{ github.event.workflow_run.id }}