chore: update CI test est_time values (#38238)

Co-authored-by: sglang-bot <sglang-bot@users.noreply.github.com>

test/registered/mem_cache/test_int8_checkpoint_store.py

@@ -22,7 +22,7 @@ from sglang.test.ci.ci_register import register_cpu_ci
 # case self-skips when no GPU is present), so they run on the cheapest CI tier.
 # The int8 GPU decode path is covered end-to-end by
 # test_int8_mamba_checkpoint_e2e (now in the extra stage).
-register_cpu_ci(est_time=15, suite="base-a-test-cpu")
+register_cpu_ci(est_time=6, suite="base-a-test-cpu")
 
 H, V, K = 32, 128, 128
 L = 4

test/registered/mem_cache/test_post_capture_kv_sizing.py

@@ -28,7 +28,7 @@ from sglang.test.test_utils import (
 )
 
 # CI Registration
-register_cuda_ci(est_time=100, stage="base-b", runner_config="1-gpu-large")
+register_cuda_ci(est_time=75, stage="base-b", runner_config="1-gpu-large")
 
 STDOUT_FILENAME = "post_capture_kv_sizing_stdout.log"
 STDERR_FILENAME = "post_capture_kv_sizing_stderr.log"