Skip test_send_periodic_duration() in CI #771

Job	Run time
static-code-analysis	40s
format	22s
build	17s
docs	1m 29s
test (ubuntu-latest, false, 3.8)	3m 8s
test (ubuntu-latest, false, 3.9)	2m 45s
test (ubuntu-latest, false, 3.10)	2m 56s
test (ubuntu-latest, false, 3.11)	3m 2s
test (ubuntu-latest, false, 3.12)	3m 3s
test (ubuntu-latest, false, pypy-3.8)	3m 25s
test (ubuntu-latest, false, pypy-3.9)	3m 53s
test (macos-latest, false, 3.10)	1m 37s
test (macos-latest, false, 3.11)	1m 19s
test (macos-latest, false, 3.12)	1m 8s
test (macos-latest, false, pypy-3.8)	2m 31s
test (macos-latest, false, pypy-3.9)	2m 29s
test (windows-latest, false, 3.8)	2m 12s
test (windows-latest, false, 3.9)	2m 6s
test (windows-latest, false, 3.10)	2m 16s
test (windows-latest, false, 3.11)	2m 10s
test (windows-latest, false, 3.12)	2m 52s
test (windows-latest, false, pypy-3.8)	6m 59s
test (windows-latest, false, pypy-3.9)	6m 49s
test (3.8, macos-13, false)	2m 4s
test (3.9, macos-13, false)	2m 6s
upload_pypi	0s
coveralls	4s
	1h 3m 42s

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