build(deps): 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/docker-heartbeats-processor.yaml

@@ -69,7 +69,7 @@ jobs:
       - build-heartbeat-processor-image
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: /tmp/digests
           pattern: heartbeat-processor-digests-*

.github/workflows/docker.yaml

@@ -216,7 +216,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Download frontend digest artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: /tmp/digests
           pattern: frontend-digests-*

.github/workflows/tests.yaml

@@ -278,7 +278,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Download mina binary
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: bin-${{ github.sha }}
 
@@ -425,7 +425,7 @@ jobs:
             rm -rf /var/lib/apt/lists/*
 
       - name: Download tests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: tests*-${{ github.sha }}
           merge-multiple: true
@@ -506,13 +506,13 @@ jobs:
             rm -rf /var/lib/apt/lists/*
 
       - name: Download tests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: tests*-${{ github.sha }}
           merge-multiple: true
 
       - name: Download tests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: tests-webrtc*-${{ github.sha }}
           merge-multiple: true
@@ -563,7 +563,7 @@ jobs:
             rm -rf /var/lib/apt/lists/*
 
       - name: Download tests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: tests*-${{ github.sha }}
           merge-multiple: true
@@ -598,12 +598,12 @@ jobs:
 
     steps:
       - name: Download binary
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: bin-${{ github.sha }}
 
       - name: Download test
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: tests*-${{ github.sha }}
           merge-multiple: true