[Snyk] Security upgrade openjdk from 17-alpine to 21-ea-23-jdk-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 openjdk:21-ea-23-jdk-slim, as this image has only 49 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
	500	Out-of-bounds Read SNYK-ALPINE314-APKTOOLS-1533752	No Known Exploit
	500	Out-of-bounds Read SNYK-ALPINE314-LIBTASN1-3173577	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	500	Buffer Overflow SNYK-ALPINE314-OPENSSL-1569445	No Known Exploit
	500	Out-of-bounds Write SNYK-ALPINE314-ZLIB-2976174	No Known Exploit

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