robustness: do not panic when parsing unknown versions.

[siyuanfoundation]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

To fix #19215

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.74%. Comparing base (5d47d7f) to head (672ba74).
Report is 9 commits behind head on main.

Additional details and impacted files

see 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19226      +/-   ##
==========================================
- Coverage   68.76%   68.74%   -0.03%     
==========================================
  Files         420      420              
  Lines       35650    35650              
==========================================
- Hits        24514    24506       -8     
- Misses       9714     9718       +4     
- Partials     1422     1426       +4     

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[siyuanfoundation]

/retest

[siyuanfoundation]

/cc @ahrtr @serathius

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, siyuanfoundation

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[ahrtr]

Since it's failing the workflow frequently, let me merge it for now..

[ahrtr]

Thanks @siyuanfoundation for the quick fix.