[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 35 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
	614	NULL Pointer Dereference SNYK-UBUNTU1804-OPENSSL-1049135	No Known Exploit
	514	Integer Overflow or Wraparound SNYK-UBUNTU1804-OPENSSL-1075560	No Known Exploit
	614	NULL Pointer Dereference SNYK-UBUNTU1804-OPENSSL-1089073	No Known Exploit
	514	Out-of-bounds Read SNYK-UBUNTU1804-OPENSSL-1569460	No Known Exploit
	614	Buffer Overflow SNYK-UBUNTU1804-OPENSSL-1569474	No Known Exploit

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