chore(deps): update openjdk docker tag to v20

[renovate-bot]

trafficstars

This PR contains the following updates:

Package	Type	Update	Change
openjdk	final	major	18-slim -> 20-slim
openjdk	stage	major	18-slim -> 20-slim

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Configuration

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[bourgeoisor]

The error on the failed build means that we'll need to bump gradle and/or the Java CLIs in the images and/or in the runners.

[mathieu-benoit]

Current issue:

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'app'.
> Could not open cp_proj generic class cache for build file '/app/build.gradle' (/root/.gradle/caches/7.5.1/scripts/6m6gn08gu1fwvcwvbupnihup8).
   > BUG! exception in phase 'semantic analysis' in source unit '_BuildScript_' Unsupported class file major version 64

This adservice app has been upgraded to openjdk:18 and gradle-7.5.1 recently, let's now see what it takes to have this working with openjdk:20!

[mathieu-benoit]

Java 19 just went GA https://jdk.java.net/19/release-notes, so closing this one as we need first to move to Java 19 and later see if we want/need to move to Java 20.

[forking-renovate[bot]]

Renovate Ignore Notification

As this PR has been closed unmerged, Renovate will ignore this upgrade and you will not receive PRs for any future 20.x releases. However, if you upgrade to 20.x manually then Renovate will reenable minor and patch updates automatically.

If this PR was closed by mistake or you changed your mind, you can simply rename this PR and you will soon get a fresh replacement PR opened.