Fix syntax for Codecov token reference in build-test.yml

Author: tsutomi

.github/workflows/build-test.yml

@@ -208,7 +208,7 @@ jobs:
           --coverage-output coverage.cobertura.xml
 
       - name: Upload coverage to Codecov
-        if: inputs.collect-coverage == true && secrets['codecov-token'] != ''
+        if: inputs.collect-coverage == true && ${{ secrets.codecov-token }} != ''
         uses: codecov/codecov-action@v4
         with:
           files: ./test/**/TestResults/coverage.cobertura.xml