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/cto-audit.yml

@@ -55,7 +55,7 @@ jobs:
             "https://api.github.com/repos/${{ env.CTO_WATCHDOG_REPO }}/contents/config/repo-registry.json" 2>/dev/null || true
 
       - name: Upload scripts artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: cto-watchdog-scripts
           path: cto-watchdog/
@@ -125,7 +125,7 @@ jobs:
           fi
 
       - name: Upload audit report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: audit-${{ matrix.repo }}
           path: /tmp/audit-report.json
@@ -252,7 +252,7 @@ jobs:
           echo "  Stale branches (>60 days): $STALE"
 
       - name: Upload audit report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: audit-${{ matrix.repo }}
           path: /tmp/audit-report.json
@@ -325,7 +325,7 @@ jobs:
           cat /tmp/weekly-summary.md
 
       - name: Upload summary
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: weekly-audit-summary
           path: /tmp/weekly-summary.md

.github/workflows/cto-consolidate.yml

@@ -164,7 +164,7 @@ jobs:
           EOF
 
       - name: Upload report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: branch-cleanup-report
           path: /tmp/branch-cleanup-report.md

.github/workflows/cto-watch.yml

@@ -87,7 +87,7 @@ jobs:
           echo "📊 Scripts downloaded successfully"
 
       - name: Upload scripts artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: cto-watchdog-scripts
           path: cto-watchdog/
@@ -228,7 +228,7 @@ jobs:
           " 2>/dev/null || true
 
       - name: Upload audit report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: audit-report
           path: /tmp/audit-report.json
@@ -305,7 +305,7 @@ jobs:
           fi
 
       - name: Upload fixes report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: safe-fixes
           path: /tmp/fixes.json