Bump actions/upload-artifact from 6 to 7 (#1542)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
           cmd /c "$env:VSDevCmd" "&" msbuild /m /clp:ForceConsoleColor "$env:msbuild_config_props" cppwinrt.sln /t:cppwinrt
 
       - name: Upload built executables
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: msvc-build-${{ matrix.compiler}}-${{ matrix.arch }}-${{ matrix.config }}-bin
           path: |
@@ -230,7 +230,7 @@ jobs:
 
       - name: Upload arm64 test executables
         if: matrix.arch == 'arm64'
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: msvc-tests-${{ matrix.test_exe }}-${{ matrix.compiler }}-${{ matrix.arch }}-${{ matrix.config }}-bin
           path: |
@@ -269,7 +269,7 @@ jobs:
           cmake --build build/cross_x64/ --target install -j2
 
       - name: Upload cppwinrt.exe
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: cross-build-${{ matrix.arch }}-bin
           path: install/bin/cppwinrt.exe
@@ -383,7 +383,7 @@ jobs:
           }
 
       - name: Upload nuget package artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: package
           path: "*.nupkg"