Fix flaky tests (#1123)

prefer IPv4 to fix 'Unrecognized Windows Sockets error: 10106: create'

Author: oliverlietz

.github/workflows/maven.yml

@@ -22,4 +22,4 @@ jobs:
           distribution: 'temurin'
           java-version: ${{ matrix.java-version }}
       - run: mvn wrapper:wrapper --no-transfer-progress -Dmaven="3.9.9"
-      - run: ./mvnw -B install --fail-at-end --no-transfer-progress --file pom.xml
+      - run: ./mvnw -B install --fail-at-end --no-transfer-progress --file pom.xml -Djava.net.preferIPv4Stack=true