Update dependency mysql:mysql-connector-java to v8

[dev-mend-for-github-com]

This PR contains the following updates:

Package	Type	Update	Change
mysql:mysql-connector-java	compile	major	5.1.24 → 8.0.16

By merging this PR, the below vulnerabilities will be automatically resolved:

Severity	CVSS Score	Vulnerability	Reachability
High	8.8	CVE-2018-3258
High	8.5	CVE-2017-3523
Medium	6.4	CVE-2017-3586
Medium	6.3	CVE-2019-2692
Medium	5.0	CVE-2020-2934
Medium	4.7	CVE-2020-2875
Low	3.3	CVE-2017-3589
Low	2.2	CVE-2020-2933

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