Add exist_ok to fix race condition in get_cache_dir #33

Job	Run time
Build_Publish_Azure_DevOps_CLI_Extension	16s
Build_Publish_Azure_CLI_Test_SDK	1m 33s
Check_Back_Compat_Arguments	4m 20s
Run_Style_Check	1m 33s
Run_Markdown_Lint_Check	30s
Run_Test_Mac_Azure_CLI_Released_Version (3.12)	2m 47s
Run_Test_Ubuntu (3.12)	1m 58s
Run_Test_Mac_Azure_CLI_Released_Version (3.11)	2m 17s
Run_Test_Windows (3.12)	3m 42s
Run_Test_Ubuntu (3.11)	1m 35s
Run_Test_Mac (3.12)	2m 35s
Run_Test_Windows (3.11)	3m 41s
Run_Test_Mac (3.11)	2m 19s
Run_Test_Ubuntu (3.10)	1m 43s
Run_Test_Mac_Azure_CLI_Released_Version (3.10)	2m 18s
Run_Test_Windows (3.10)	5m 59s
Run_Test_Mac (3.10)	2m 8s
Run_Test_Ubuntu (3.9)	1m 58s
Run_Test_Windows (3.9)	3m 36s
Run_Test_Mac_Azure_CLI_Released_Version (3.9)	1m 51s
Run_Test_Mac (3.9)	1m 56s
Code_Coverage	2m 1s
Run_HelpText_Check	1m 27s
Run_Test_From_Old_Release	0s
	54m 3s

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