Bump actions/download-artifact from 5 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/publish-go-tester-task.yml

@@ -140,7 +140,7 @@ jobs:
 
     steps:
       - name: Download build artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
 
       - name: Create checksum file
         run: |

.github/workflows/release-go-task.yml

@@ -104,7 +104,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Download artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: ${{ env.ARTIFACT_PREFIX }}${{ matrix.build.artifact-suffix }}
           path: ${{ env.DIST_DIR }}
@@ -194,7 +194,7 @@ jobs:
 
     steps:
       - name: Download artifact
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: ${{ env.ARTIFACT_PREFIX }}*
           merge-multiple: true

.github/workflows/sync-labels.yml

@@ -108,7 +108,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Download configuration file artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           merge-multiple: true
           pattern: ${{ env.CONFIGURATIONS_ARTIFACT_PREFIX }}*