Change seed to update test schedule

[alyssa-sm]

The two a3-ultra tests using the same reservation are scheduled too closely together which can cause conflicts. Updated the seed to change the order of tests. The updated times of the tests sharing a reservation are below.

A3-ultragpu:

$ ./list_tests.py 30 300 | jq '."gke-a3-ultragpu", ."ml-a3-ultragpu-slurm"'
"35 2 * * MON-FRI"
"28 4 * * MON-FRI"

A3-megagpu:

$ ./list_tests.py 30 300 | jq '."gke-a3-megagpu", ."ml-a3-megagpu-slurm"'
"42 0 * * MON-FRI"
"6 3 * * MON-FRI"

A3-highgpu:

$ ./list_tests.py 30 300 | jq '."gke-a3-highgpu", ."ml-a3-highgpu-slurm"'
"16 2 * * MON-FRI"
"22 4 * * MON-FRI"