[Snyk] Security upgrade tomcat from 9.0.21-jdk8-adoptopenjdk-hotspot to 9-jdk8-adoptopenjdk-hotspot

[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

• security-gateway/uaa/Dockerfile

We recommend upgrading to tomcat:9-jdk8-adoptopenjdk-hotspot, as this image has only 100 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
	721	Access Restriction Bypass SNYK-UPSTREAM-OPENJDKJRE-2767963	Proof of Concept
	721	NULL pointer dereference SNYK-UPSTREAM-OPENJDKJRE-473431	Proof of Concept
	614	Improper Security Check SNYK-UPSTREAM-OPENJDKJRE-565802	No Known Exploit
	614	Sandbox Bypass SNYK-UPSTREAM-OPENJDKJRE-584582	No Known Exploit
	614	Sandbox Bypass SNYK-UPSTREAM-OPENJDKJRE-584583	No Known Exploit

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