[Snyk] Security upgrade tomcat from 8.0 to 8

[Security-Test-Account]

This PR was automatically created by Snyk using the credentials of a real user.

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 tomcat:8, as this image has only 25 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 Write SNYK-DEBIAN8-BZIP2-450781	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN8-CURL-336284	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN8-CURL-358408	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN8-PERL-327620	No Known Exploit
	786	Race Condition SNYK-DEBIAN8-WGET-300469	Mature

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