Bump actions/download-artifact from 7 to 8 in /workflow-templates

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

workflow-templates/compile-examples-private.yml

@@ -85,7 +85,7 @@ jobs:
       - name: Download sketches reports artifact
         id: download-artifact
         continue-on-error: true # If compilation failed for all boards then there are no artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ${{ env.SKETCHES_REPORTS_PATH }}
 

workflow-templates/compile-platform-examples-private.yml

@@ -103,7 +103,7 @@ jobs:
       - name: Download sketches reports artifact
         id: download-artifact
         continue-on-error: true # If compilation failed for all boards then there are no artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ${{ env.SKETCHES_REPORTS_PATH }}
 

workflow-templates/compile-sketches-private.yml

@@ -91,7 +91,7 @@ jobs:
       - name: Download sketches reports artifact
         id: download-artifact
         continue-on-error: true # If compilation failed for all boards then there are no artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: ${{ env.SKETCHES_REPORTS_PATH }}