[Snyk] Security upgrade io.javalin:javalin from 3.1.0 to 3.13.0#122

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-ec7bcd0b729e9cb86a02f094cc1458d8

Commits on Jan 20, 2021

fix: javalin/pom.xml to reduce vulnerabilities
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