Remove spaces in test results list (the files are not found otherwise)

Author: mgrojo

.github/workflows/main.yml

@@ -129,6 +129,6 @@ jobs:
         if: ${{ !cancelled() }}
         uses: codecov/codecov-action@v5
         with:
-          files: server/tests/coap_results.xml, server/tests/coaps_results.xml, client/tests/coap_results.xml, client/tests/coaps_results.xml
+          files: server/tests/coap_results.xml,server/tests/coaps_results.xml,client/tests/coap_results.xml,client/tests/coaps_results.xml
           token: ${{ secrets.CODECOV_TOKEN }}
           report_type: test_results