unit tests can't run in parallel currently

Author: chingor13

.github/workflows/ci.yaml

@@ -87,8 +87,7 @@ jobs:
           -Dflatten.skip=true \
           -Danimal.sniffer.skip=true \
           -Dmaven.wagon.http.retryHandler.count=5 \
-          --also-make \
-          -T 1C
+          --also-make
       env:
         JOB_TYPE: test
         JOB_NAME: units-8-runtime-${{matrix.java}}