[Snyk] Upgrade org.slf4j:slf4j-api from 1.7.21 to 1.7.30

[snyk-bot]

Snyk has created this PR to upgrade org.slf4j:slf4j-api from 1.7.21 to 1.7.30.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 9 versions ahead of your current version.
• The recommended version was released 4 months ago, on 2019-12-16.

The recommended version fixes:

Severity	Issue
	EPL-1.0 license snyk:lic:maven:junit:junit:EPL-1.0

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