ci(deps): bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/security.yml

@@ -37,7 +37,7 @@ jobs:
         run: npm audit --json > npm-audit-results.json || true
 
       - name: Upload audit results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: npm-audit-results
           path: npm-audit-results.json
@@ -67,7 +67,7 @@ jobs:
         run: npm outdated --json > outdated-packages.json || true
 
       - name: Upload outdated packages report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: outdated-packages
           path: outdated-packages.json
@@ -138,7 +138,7 @@ jobs:
         run: license-checker --json --production > license-report.json || true
 
       - name: Upload license report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: license-report
           path: license-report.json

.github/workflows/snyk.yml

@@ -49,7 +49,7 @@ jobs:
           cat snyk-results.json | head -200 || echo "No results file"
 
       - name: Upload Snyk results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: snyk-results
           path: snyk-results.json