[Snyk] Security upgrade tomcat from 8.5.21 to 8.5.72

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 Merge Request

• Dockerfile

We recommend upgrading to tomcat:8.5.72, as this image has only 104 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	Out-of-bounds Read SNYK-DEBIAN9-CURL-358855	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN9-CURL-358869	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-CURL-466505	No Known Exploit
	714	Double Free SNYK-DEBIAN9-CURL-466508	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-WGET-342192	No Known Exploit

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