Update dependency flask to v0.12.5

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This PR contains the following updates:

Package	Update	Change
flask (changelog)	minor	==0.10 -> ==0.12.5

By merging this PR, the issue #1 will be automatically resolved and closed:

Severity	CVSS Score	CVE
High	7.5	CVE-2018-1000656
High	7.5	CVE-2019-1010083

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