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/ci.yml

@@ -106,14 +106,14 @@ jobs:
 
       - name: Fetch cppwinrt executables
         if: matrix.arch != 'arm64'
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: msvc-build-${{ matrix.compiler}}-${{ matrix.arch }}-${{ matrix.config }}-bin
           path: _build/${{ matrix.arch }}/${{ matrix.config }}/
 
       - name: Fetch x86 cppwinrt executables (arm64 only)
         if: matrix.arch == 'arm64'
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: msvc-build-${{ matrix.compiler}}-x86-Release-bin
           path: _build/x86/Release/
@@ -326,7 +326,7 @@ jobs:
       - uses: actions/checkout@v5
 
       - name: Fetch cppwinrt executables
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: msvc-build-${{ matrix.compiler}}-${{ matrix.arch }}-${{ matrix.config }}-bin
           path: _build/${{ matrix.arch }}/${{ matrix.config }}/