CI: Use alpine 3.20 in cloner stage

[f-fl0]

No description provided.

[sqbot]

[345] PASSED on noetic

All tests passed

build/test_results/urg_stamped/gtest-test_decode.xml: 4 tests
build/test_results/urg_stamped/gtest-test_device_state_estimator.xml: 12 tests
build/test_results/urg_stamped/gtest-test_param.xml: 12 tests
build/test_results/urg_stamped/gtest-test_scip2.xml: 2 tests
build/test_results/urg_stamped/gtest-test_walltime.xml: 4 tests
build/test_results/urg_stamped/roslint-urg_stamped.xml: 1 tests
build/test_results/urg_stamped/rostest-test_tests_e2e.xml: 1 tests
build/test_results/urg_stamped/rostest-test_tests_sync_timing.xml: 1 tests
build/test_results/urg_stamped/rosunit-e2e.xml: 20 tests
build/test_results/urg_stamped/rosunit-sync_timing.xml: 2 tests
Summary: 59 tests, 0 errors, 0 failures, 0 skipped

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.58%. Comparing base (62d2346) to head (7cf40c2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #176      +/-   ##
==========================================
+ Coverage   83.57%   83.58%   +0.01%     
==========================================
  Files          34       34              
  Lines        1546     1547       +1     
==========================================
+ Hits         1292     1293       +1     
  Misses        254      254              

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