Retry code coverage upload on failure

Noticed in several results of
https://github.com/opensearch-project/security/actions/runs/5978371801/job/16220344142?pr=3123
that the code coverage upload had failed silently, and the annotations
make it look like many tests were not executed.  Since in this job there
were 9 failures at the same time, adding retry mechanism as well to
prevent blind restarting of workflows.

Signed-off-by: Peter Nied <petern@amazon.com>

.github/workflows/ci.yml

@@ -60,10 +60,15 @@ jobs:
           ${{ matrix.gradle_task }} -Dbuild.snapshot=false
 
     - name: Coverage
-      uses: codecov/codecov-action@v3
+      uses: Wandalen/wretry.action
       with:
-        token: ${{ secrets.CODECOV_TOKEN }}
-        files: ./build/reports/jacoco/test/jacocoTestReport.xml
+        attempt_limit: 3
+        attempt_delay: 2000
+        action: codecov/codecov-action@v3
+        with: |
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true
+          files: ./build/reports/jacoco/test/jacocoTestReport.xml
 
     - uses: actions/upload-artifact@v3
       if: always()