[Snyk] Security upgrade openjdk from 8-jdk to 16.0.2-jdk

[Say383]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• jfrog/examples/maven-example/Dockerfile

We recommend upgrading to openjdk:16.0.2-jdk, as this image has only 180 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	714	Double Free SNYK-DEBIAN11-CURL-1585150	No Known Exploit
	714	Incorrect Default Permissions SNYK-DEBIAN11-CURL-2936229	No Known Exploit
	714	Exposure of Resource to Wrong Sphere SNYK-DEBIAN11-CURL-3065656	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN11-GIT-3232722	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN11-LIBTASN16-3061097	No Known Exploit

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