fix: handle unexpected missing token expiry by setting a default

[ilijamt]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.75%. Comparing base (8c189a1) to head (61fff4d).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
gitlab_client.go	55.55%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
- Coverage   95.94%   95.75%   -0.20%     
==========================================
  Files          27       27              
  Lines        1947     1953       +6     
==========================================
+ Hits         1868     1870       +2     
- Misses         56       59       +3     
- Partials       23       24       +1     

Flag	Coverage Δ
unittests	95.75% <55.55%> (-0.20%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[ilijamt]

@codecov-ai-reviewer test

[codecov-ai]

On it! Codecov is generating unit tests for this PR.