chore: update codecov-action to v4

Author: vil02

.github/workflows/upload_coverage_report.yml

@@ -23,9 +23,17 @@ jobs:
       - name: Generate code coverage
         run: |
           go test -coverprofile="${{ env.REPORT_NAME }}" ./...
-      - name: Upload coverage to codecov
-        uses: codecov/codecov-action@v3
+      - name: Upload coverage to codecov (tokenless)
+        if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository
+        uses: codecov/codecov-action@v4
         with:
           files: "${{ env.REPORT_NAME }}"
           fail_ci_if_error: true
+      - name: Upload coverage to codecov (with token)
+        if: "! github.event.pull_request.head.repo.fork "
+        uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: "${{ env.REPORT_NAME }}"
+          fail_ci_if_error: true
 ...