Bump actions/download-artifact from 6 to 7 (#136)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/dotnet.yaml

@@ -104,7 +104,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download NuGet artifact
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           name: nuget-package
       - name: Check NuGet contents
@@ -117,7 +117,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Download NuGet artifact
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
       - name: Tag and release packages
         env:
           GITHUB_TOKEN: "mock-token"
@@ -151,7 +151,7 @@ jobs:
       contents: read
     steps:
       - name: Download NuGet artifact
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           name: nuget-package
           path: downloaded
@@ -184,7 +184,7 @@ jobs:
         with:
           token: ${{ steps.app-token.outputs.token }}
       - name: Download NuGet artifact
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
       - name: Tag and release packages
         env:
           GITHUB_TOKEN: ${{ steps.app-token.outputs.token }}