Standardize git repo for HAProxy

General MR

Summary

Adds .git suffix to the HAProxy repo value to match standards.

Closes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/1287

changed milestone to %1.42.0

added statusreview label

assigned to @micah.nagel

approved this merge request

merged

mentioned in commit c5e7e5ab