CI flake: Failed to get rust package

https://github.com/clockworklabs/SpacetimeDB/actions/runs/26849059824/job/79176296760

Run cargo ci update-flow --target=x86_64-unknown-linux-gnu --github-token-auth
    Updating crates.io index
    Updating git repository `[https://github.com/clockworklabs/iai-callgrind.git`](https://github.com/clockworklabs/iai-callgrind.git%60)
error: failed to get `iai-callgrind` as a dependency of package `spacetimedb-bench v2.4.0 (/home/runner/actions-runner/_work/SpacetimeDB/SpacetimeDB/crates/bench)`

Caused by:
  failed to load source for dependency `iai-callgrind`

Caused by:
  Unable to update https://github.com/clockworklabs/iai-callgrind.git?branch=main#3e78f685

Caused by:
  failed to clone into: /home/runner/.cargo/git/db/iai-callgrind-def8f782d3b14426

Caused by:
  revision 3e78f68534bbe389e0fb00f729a6a7b877627a06 not found

Caused by:
  network failure seems to have happened
  if a proxy or similar is necessary `net.git-fetch-with-cli` may help here
  https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli

Caused by:
  SSL error: unknown error; class=Ssl (16)
Error: Process completed with exit code 101.

Start with the linked GitHub Actions job and reproduce the cargo ci update-flow --target=x86_64-unknown-linux-gnu --github-token-auth command. Inspect how the iai-callgrind dependency is fetched for spacetimedb-bench, then verify that the CI job can resolve the pinned revision without the reported SSL or network failure.