Update TESTBenches.md to reflect current testbench

doc/TESTBenches.md

@@ -176,7 +176,7 @@ information on how the images are built.
   - uses RFsimulator, for FDD 5, 10, 20MHz with core, 5MHz noS1
 - [RAN-RF-Sim-Test-5G](https://jenkins-oai.eurecom.fr/job/RAN-RF-Sim-Test-5G/)
   ~5G-NR
-  - obelix (gNB, nrUE, OAI 5GC)
+  - cacofonix (gNB, nrUE, OAI 5GC)
   - uses RFsimulator, TDD 40MHz, FDD 40MHz, F1 split
 - [RAN-SA-AW2S-CN5G](https://jenkins-oai.eurecom.fr/job/RAN-SA-AW2S-CN5G/)
   ~5G-NR