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] <[email protected]>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -344,7 +344,7 @@ jobs:
     - uses: actions/checkout@v5
 
     - name: Download payload
-      uses: actions/download-artifact@v5
+      uses: actions/download-artifact@v6
       with:
         name: tmp.dotnet-tool-build
 
@@ -387,7 +387,7 @@ jobs:
     - uses: actions/checkout@v5
 
     - name: Download signed payload
-      uses: actions/download-artifact@v5
+      uses: actions/download-artifact@v6
       with:
         name: dotnet-tool-payload-sign
         path: signed
@@ -419,7 +419,7 @@ jobs:
     - uses: actions/checkout@v5
 
     - name: Download unsigned package
-      uses: actions/download-artifact@v5
+      uses: actions/download-artifact@v6
       with:
         name: tmp.dotnet-tool-package-unsigned
         path: nupkg
@@ -502,7 +502,7 @@ jobs:
           dotnet-version: 8.0.x
 
       - name: Download artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: ${{ matrix.component.artifact }}
 
@@ -572,7 +572,7 @@ jobs:
           dotnet-version: 8.0.x
 
       - name: Download artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
 
       - name: Archive macOS payload and symbols
         run: |