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/playground.yml

@@ -57,7 +57,7 @@ jobs:
     needs: [playground-job]
     steps:
       - name: Download binaries built by go-releaser from previous job
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: go-releaser-binaries
           path: app2/ # this path will contain app1 and app2

.github/workflows/release.yml

@@ -98,7 +98,7 @@ jobs:
           fetch-depth: 0
 
       - name: Download binaries built by go-releaser from previous job
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: go-releaser-binaries
           path: app/ # must specify path (e.g. same as during upload), or files end up on root (?)
@@ -198,7 +198,7 @@ jobs:
     needs: [docker-push]
     steps:
       - name: Download image digests
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           # see comment in upload-artifact@v4, we need to merge by pattern due to the platform specific names
           pattern: digests-*