Update UnitTest.yml

Author: ViralBShah

.github/workflows/UnitTest.yml

@@ -46,7 +46,7 @@ jobs:
         uses: julia-actions/julia-runtest@v1
 
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info
           token: ${{ secrets.CODECOV_TOKEN }}