[Snyk] Security upgrade tomcat from 8.5.21 to 8.5.77

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:8.5.77, as this image has only 103 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	Integer Overflow or Wraparound SNYK-DEBIAN9-LIBIDN20-274945	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN9-LIBXML2-429367	No Known Exploit
	778	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN9-OPENSSL-2426305	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN9-OPENSSL-2807589	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-WGET-342192	No Known Exploit

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