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/changelog-for-all.yml

@@ -135,7 +135,7 @@ jobs:
         with:
           delete-merged: true
 
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: merged-artifacts
 

.github/workflows/redirector-update.yml

@@ -259,7 +259,7 @@ jobs:
           rm -rf downloads/*
 
       - name: "Download artifacts"
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: debs-beta
           path: downloads
@@ -294,7 +294,7 @@ jobs:
           rm -rf downloads/*
 
       - name: "Download artifacts"
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: debs
           path: downloads
@@ -328,7 +328,7 @@ jobs:
           rm -rf downloads/*
 
       - name: "Download artifacts"
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: archive
           path: downloads
@@ -363,7 +363,7 @@ jobs:
           rm -rf downloads/*
 
       - name: "Download artifacts"
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: images
           path: downloads
@@ -406,7 +406,7 @@ jobs:
           fileName: "*.mmdb"
 
       - name: "Download artifacts"
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: redirector-config
           path: downloads