[Snyk] Security upgrade tomcat from 9.0.40-jdk15-openjdk-slim to 9-jdk15-openjdk-slim

[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

• Dockerfile

We recommend upgrading to tomcat:9-jdk15-openjdk-slim, as this image has only 60 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-DEBIAN10-OPENSSL-1075326	No Known Exploit
	514	Information Exposure SNYK-DEBIAN10-OPENSSL-536856	No Known Exploit
	514	Out-of-bounds Read SNYK-DEBIAN10-P11KIT-1050832	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN10-P11KIT-1050833	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN10-P11KIT-1050836	No Known Exploit

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[secure-code-warrior-for-github]

Micro-Learning Topic: Integer overflow (Detected by phrase)

What is this? (2min video)

Integer overflow occurs when the result of arithmetic operation is greater than the maximum value the integer data type can store.
For example, if an integer data type allows integers up to two bytes or 16 bits in length (or an unsigned number up to decimal 65,535), and two integers are to be added together that will exceed the value of 65,535, the result will be integer overflow.

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Micro-Learning Topic: Information disclosure (Detected by phrase)

Many web applications and APIs do not properly protect sensitive data, such as financial, healthcare, and PII. Attackers may steal or modify such weakly protected data to conduct credit card fraud, identity theft, or other crimes. Sensitive data may be compromised without extra protection, such as encryption at rest or in transit, and requires special precautions when exchanged with the browser. Source: https://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project

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