Jenkins: Increase memory in VMs
Jenkins: Increase memory in VMs

Issues on builds:
https://jenkins.cilium.io/job/Ginkgo-CI-Tests-Pipeline/1767/
https://jenkins.cilium.io/job/Ginkgo-CI-Tests-Pipeline/1766/

Kafka has no enough memory to start, and container died and test failed.
Logs from kafka container:

```
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c0000000, 1073741824, 0) failed; error='Cannot allocate memory' (errno=12)
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000c0000000, 1073741824, 0) failed; error='Cannot allocate memory' (errno=12)
```

Signed-off-by: Eloy Coto <2a8acc28452926ceac4d9db555411743254cf5f9@gmail.com>

scanf/cilium,cilium-team/cilium,tgraf/cilium,scanf/cilium,eloycoto/cilium,tklauser/cilium,cilium-team/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,scanf/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,eloycoto/cilium,scanf/cilium,tklauser/cilium,eloycoto/cilium,eloycoto/cilium,tgraf/cilium,cilium/cilium,scanf/cilium,michi-covalent/cilium,scanf/cilium,eloycoto/cilium,eloycoto/cilium,cilium/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,eloycoto/cilium,scanf/cilium,michi-covalent/cilium