Increasing number of threads on CI test step

Author: pebeto

.github/workflows/CI.yml

@@ -57,6 +57,7 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
         env:
+          JULIA_NUM_THREADS: '2'
           MLFLOW_TRACKING_URI: "http://localhost:5000/api"
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v3