CIFuzz: Update upload-artifact to v4 (google#311)

This fixes the following error:

> Error: This request has been automatically failed because it uses a
> deprecated version of `actions/upload-artifact: v3`. Learn more:
> https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

Author: derekmauro

.github/workflows/cifuzz.yml

@@ -17,7 +17,7 @@ jobs:
         fuzz-seconds: 300
         dry-run: false
     - name: Upload Crash
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: failure() && steps.build.outcome == 'success'
       with:
         name: artifacts