Update dependency org.mybatis:mybatis to v3.5.6

[dev-mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
org.mybatis:mybatis (source)	compile	minor	3.1.1 -> 3.5.6

By merging this PR, the issue #4 will be automatically resolved and closed:

Severity	CVSS Score	CVE	Reachability
High	8.1	CVE-2020-26945	Reachable

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