CI flake: Prepare SDK test clients (native) #6170

Detected by CI Gremlin after a failed GitHub Actions attempt succeeded on rerun.

Tests:

• Prepare SDK test clients (native)

Error:
fatal: couldn't find remote ref refs/heads/gh-readonly-queue/master/pr-6101-d3b49e9abbd1c99fda3ab3484b411a82bcc23067
The process '/usr/bin/git' failed with exit code 128

Failed job runs:

• https://github.com/clockworklabs/SpacetimeDB/actions/runs/38492177068/job/115623609371 (Prepare SDK test clients (native), attempt 1 -> 2)

Timeout detection:

• none

Context:

• none