Add us2.ddog-gov.com. #17604

Job	Run time
test / test (2.7, ubuntu-latest)	3m 10s
pre-commit / pre-commit	59s
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 37s
examples / examples	2m 47s
test / test (3.2, ubuntu-latest)	2m 41s
report	7s
	13m 21s

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