Paul Gschwendtner fa84d19e97 refactor(dev-infra): always use en-US locale for printing date in merge tool (#42470)
In the dev-infra merge tool, a test fails locally if it runs on
a system with a different system locale. We can either make the
test more flexible, or update the merge tool to always print the date
in `en-US` format. The latter is more reasonable given our console
messages being in english anyway.

PR Close #42470
2021-06-03 13:19:03 -07:00
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