Upgrade Python requirements #637

Job	Run time
Test aip-encrypt on Firefox	19m 5s
Test aip-encrypt on Chrome	19m 39s
Test aip-encrypt-mirror on Firefox	13m 14s
Test aip-encrypt-mirror on Chrome	13m 5s
Test black-box on Chrome	29m 24s
Test icc on Firefox	14m 14s
Test icc on Chrome	13m 44s
Test ipc preservation on Firefox	18m 56s
Test ipc preservation on Chrome	18m 47s
Test ipc access on Firefox	18m 35s
Test ipc access on Chrome	18m 24s
Test metadata-xml on Firefox	19m 41s
Test metadata-xml on Chrome	19m 9s
Test tcc on Firefox	14m 19s
Test tcc on Chrome	13m 27s
Test tpc on Firefox	14m 29s
Test tpc on Chrome	14m 4s
Test uuids-dirs on Firefox	14m 4s
Test uuids-dirs on Chrome	12m 55s
	5h 19m 15s

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