[Snyk] Security upgrade openjdk from 11.0.8-jre-slim to 11.0.15-jre-slim

[jnaithani]

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

• learning-maven/springboot/Dockerfile

We recommend upgrading to openjdk:11.0.15-jre-slim, as this image has only 105 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	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit
	714	OS Command Injection SNYK-DEBIAN10-OPENSSL-2807585	No Known Exploit
	786	CVE-2023-26604 SNYK-DEBIAN10-SYSTEMD-3339153	Mature
	786	CVE-2023-26604 SNYK-DEBIAN10-SYSTEMD-3339153	Mature
	714	Out-of-bounds Write SNYK-DEBIAN10-ZLIB-2976149	No Known Exploit

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