build(deps): bump actions/upload-artifact from 6 to 7

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

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/.test.yml

@@ -189,7 +189,7 @@ jobs:
       -
         name: Upload test reports
         if: always()
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: test-reports-${{ env.TEST_REPORT_NAME }}
           path: ./bin/testreports

.github/workflows/buildkit.yml

@@ -102,7 +102,7 @@ jobs:
           tree -nh .
       -
         name: Upload release binaries
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: buildkit-release
           path: ${{ env.DESTDIR }}/*

.github/workflows/dockerd.yml

@@ -67,7 +67,7 @@ jobs:
           wget -qO- "https://download.docker.com/linux/static/stable/x86_64/docker-${{ env.DOCKER_VERSION }}.tgz" | tar xvz --strip 1
       -
         name: Upload dockerd
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: dockerd
           path: /tmp/moby/dockerd

.github/workflows/test-os.yml

@@ -66,7 +66,7 @@ jobs:
           tree -nh ${{ env.DESTDIR }}
       -
         name: Upload artifacts
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: buildkit-${{ env.PLATFORM_PAIR }}
           path: ${{ env.DESTDIR }}/*
@@ -187,7 +187,7 @@ jobs:
       -
         name: Upload test reports
         if: always()
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: test-reports-${{ matrix.os }}-${{ env.TEST_REPORT_NAME }}
           path: ./bin/testreports