Update actions/download-artifact action to v8 (#3091)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

[skip ci]

Author: renovate[bot]

.github/workflows/create-changelog-pr.yml

@@ -44,7 +44,7 @@ jobs:
       - name: Create CHANGELOG directory
         run: mkdir -p ./CHANGELOG/${{ inputs.grid-version }}
       - name: Download results
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ./CHANGELOG/${{ inputs.grid-version }}
           pattern: 'image_tags_*'

.github/workflows/k8s-scaling-test.yml

@@ -223,7 +223,7 @@ jobs:
           persist-credentials: false
           fetch-depth: 0
       - name: Download results
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ./.keda
           pattern: 'results_*'
@@ -258,7 +258,7 @@ jobs:
           persist-credentials: false
           fetch-depth: 0
       - name: Download results
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ./.keda
           pattern: 'results_*'