Update dependency org.apache.shiro:shiro-core to v1.6.0

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

This PR contains the following updates:

Package	Type	Update	Change
org.apache.shiro:shiro-core	compile	minor	1.2.0 -> 1.6.0

By merging this PR, the issue #7 will be automatically resolved and closed:

Severity	CVSS Score	CVE	Reachability
High	8.1	CVE-2016-4437	Unreachable
High	7.5	CVE-2020-13933	Reachable
High	7.3	CVE-2014-0074	Unreachable

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