[Snyk] Security upgrade tomcat from 8.5.21 to 8

[assaf-enso]

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

• todolist-goof/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
	522	Out-of-bounds Write SNYK-DEBIAN9-FREETYPE-1019584	Mature
	343	Out-of-Bounds SNYK-DEBIAN9-GLIBC-356506	Mature
	511	Buffer Overflow SNYK-DEBIAN9-INETUTILS-564742	No Known Exploit
	510	Integer Overflow or Wraparound SNYK-DEBIAN9-SQLITE3-307593	No Known Exploit
	386	Out-of-Bounds SNYK-DEBIAN9-WGET-300458	No Known Exploit

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