check-opte-ver CI flake

This run seems to have been a spurious failure:
https://github.com/oxidecomputer/omicron/actions/runs/6167960563/job/16739738214?pr=4084

The output:

Run ./tools/ci_check_opte_ver.sh
  ./tools/ci_check_opte_ver.sh
  shell: /usr/bin/bash -e {0}
OPTE version mismatch:
Cargo.toml: 98d33125413f01722947e322f82caf9d22209434 (0.23.)
tools/opte_version: 0.23.173
Error: Process completed with exit code 1.

In context:

I am not sure what happened here. I see that the patch number looks wrong (0.23. vs. 0.23.173). The bash script appears to make a bunch of HTTP requests to the GitHub API to count this. I wonder if one of these failed? The script does not emit much output, either on success or failure. But rerunning the job (with no change to the repo) succeeded, so I suspect a transient GitHub issue.

This might be a candidate to rewrite as an xtask where it's easier to retry and report errors better?

The failure is in tools/ci_check_opte_ver.sh, which compares Cargo.toml with tools/opte_version; start by examining that script and the linked GitHub Actions job output. Inspect its GitHub API requests and error handling, then determine how the incomplete version value arose. Done means the cause is addressed and future transient failures provide useful diagnostics.