fix: lower mooncake memory in functional test

[yuki-97]

Summary

fix ./tests/functional/grpo_dp_mooncake.sh fail in CI (action link) when using A100 by lower mooncake memory suggested by @ZhiyuLi-Nvidia

Test Result

confirmed in action link using 3fbc3f8.

✓ Merged data written to 
/opt/nemo-rl/tests/functional/grpo_dp_mooncake/metrics.json
                                 Metric Checks                                  
┏━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━┓
┃ Status ┃ Check                             ┃ Value                 ┃ Message ┃
┡━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━┩
│ PASS   │ max(data["train/gen_kl_error"]) < │ 0.0006355919758789241 │         │
│        │ 0.002                             │                       │         │
│ PASS   │ min(data["train/probs_ratio_clam… │ 0.800000011920929     │         │
│        │ > 0.79                            │                       │         │
│ PASS   │ max(data["train/probs_ratio_clam… │ 1.0                   │         │
│        │ < 1.21                            │                       │         │
│ PASS   │ min(data["train/probs_ratio_clam… │ 1.0                   │         │
│        │ > 0.79                            │                       │         │
│ PASS   │ max(data["train/probs_ratio_clam… │ 1.2000000476837158    │         │
│        │ < 1.21                            │                       │         │
└────────┴───────────────────────────────────┴───────────────────────┴─────────┘

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[yuki-97]

/ok to test 4711c08

[yuki-97]

/ok to test 3fbc3f8

[yuki-97]

/ok to test da9f03b

[ZhiyuLi-Nvidia]

Thank you @yuki-97 ! LGTM!