Fixes the following vulnerabilities in rubygems:
CVE-2019-8320: Delete directory using symlink when decompressing tar
CVE-2019-8321: Escape sequence injection vulnerability in verbose
CVE-2019-8322: Escape sequence injection vulnerability in gem owner
CVE-2019-8323: Escape sequence injection vulnerability in API response handling
CVE-2019-8324: Installing a malicious gem may lead to arbitrary code execution
CVE-2019-8325: Escape sequence injection vulnerability in errors
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