[Snyk] Security upgrade tomcat from 8.5.21 to 8.5.88

[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

• todolist-goof/Dockerfile

We recommend upgrading to tomcat:8.5.88, as this image has only 22 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-DEBIAN9-CURL-336351	No Known Exploit
	714	Out-of-Bounds SNYK-DEBIAN9-CURL-358454	No Known Exploit
	714	Out-of-Bounds SNYK-DEBIAN9-CURL-358494	No Known Exploit
	714	CVE-2018-1000007 SNYK-DEBIAN9-CURL-358683	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN9-CURL-358714	No Known Exploit

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