ci: Remove unused matrix dimension in drivers tests (cube-js#9470)

Author: mcheshkov

.github/workflows/drivers-tests.yml

@@ -227,8 +227,6 @@ jobs:
       DRIVERS_TESTS_ATHENA_CUBEJS_AWS_KEY: ${{ secrets.DRIVERS_TESTS_ATHENA_CUBEJS_AWS_KEY }}
     strategy:
       matrix:
-        node:
-          - 20.x
         database:
           - athena-export-bucket-s3
           - bigquery-export-bucket-gcs