chore(deps): bump actions/upload-artifact from 4 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...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>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -155,7 +155,7 @@ jobs:
           uv run briefcase package windows -p zip
 
       - name: Upload Briefcase ZIP artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: briefcase-windows-zip-${{ github.sha }}
           path: dist/

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
           uv build
 
       - name: Upload Python dist artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: python-dist
           path: dist/*
@@ -130,7 +130,7 @@ jobs:
           }
 
       - name: Upload Briefcase MSI artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: briefcase-msi
           path: dist/*
@@ -218,7 +218,7 @@ jobs:
           done
 
       - name: Upload Briefcase macOS artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: briefcase-macos-arm64
           path: dist/*
@@ -268,7 +268,7 @@ jobs:
           uv run briefcase package linux system --no-input
 
       - name: Upload Briefcase Linux artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: briefcase-linux-x86_64
           path: dist/*