[Snyk] Security upgrade openjdk from 11-jdk to 11.0-jdk-slim-buster

[snyk-bot]

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

• Dockerfile

We recommend upgrading to openjdk:11.0-jdk-slim-buster, as this image has only 72 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
	400	Improper Authentication SNYK-DEBIAN11-CURL-2805482	No Known Exploit
	400	Improper Certificate Validation SNYK-DEBIAN11-CURL-2813769	No Known Exploit
	400	Improper Certificate Validation SNYK-DEBIAN11-CURL-2813769	No Known Exploit
	500	Out-of-bounds Read SNYK-DEBIAN11-PCRE2-2808697	No Known Exploit
	500	Out-of-bounds Read SNYK-DEBIAN11-PCRE2-2808704	No Known Exploit

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