Cleaning up junit dep issues in session tests.

+ Enforcer mandates common version of junit-jupiter,
  but the org.testcontainers:testcontainers brings in
  an older version.

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

tests/test-sessions/test-sessions-common/pom.xml

@@ -39,5 +39,10 @@
       <artifactId>junit-jupiter</artifactId>
       <scope>compile</scope>
     </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <scope>compile</scope>
+    </dependency>
   </dependencies>
 </project>