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

@@ -129,7 +129,7 @@ jobs:
 
       - name: Upload Playwright report
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: playwright-report
           path: e2e/playwright-report
@@ -267,7 +267,7 @@ jobs:
         working-directory: mastervault-mcp-server
         run: npx --yes @cyclonedx/cyclonedx-npm --output-file ../sbom-mastervault-mcp-server.cdx.json
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v7
         with:
           name: sbom
           path: sbom-*.cdx.json

.github/workflows/release.yml

@@ -76,7 +76,7 @@ jobs:
           echo "Found $matches artifact(s) matching '$pattern'."
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: dist-${{ matrix.os }}
           path: |