[cicd] Migrate to Java21 - documentation

Author: dizzzz

BUILD.md

@@ -1,7 +1,7 @@
 Building eXist-db from Source
 --------------------------
 
-eXist-db itself is written in Java 17. The build system is [Apache Maven](http://maven.apache.org/). If you're not familiar with Git, we recommend [this excellent online interactive tutorial](http://try.github.io).
+eXist-db itself is written in and qualified with Java 21. The build system is [Apache Maven](http://maven.apache.org/). If you're not familiar with Git, we recommend [this excellent online interactive tutorial](http://try.github.io).
 
 To build eXist-db:
 

README.md

@@ -6,11 +6,11 @@
 
 ## eXist-db Native XML Database
 
-[![Build Status](https://github.com/eXist-db/exist/actions/workflows/ci-build.yml/badge.svg?branch=develop)](https://github.com/eXist-db/exist/actions/workflows/ci-build.yml)
+[![Build Status](https://github.com/eXist-db/exist/actions/workflows/ci-test.yml/badge.svg?branch=develop)](https://github.com/eXist-db/exist/actions/workflows/ci-build.yml)
 [![Coverage Status](https://coveralls.io/repos/github/eXist-db/exist/badge.svg?branch=develop)](https://coveralls.io/github/eXist-db/exist?branch=develop)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/ae1c8a7eb1164e919b0ac3c8588560c6)](https://www.codacy.com/gh/eXist-db/exist/dashboard?utm_source=github.com&utm_medium=referral&utm_content=eXist-db/exist&utm_campaign=Badge_Grade)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=eXist-db_exist&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=eXist-db_exist)
-[![Java 17](https://img.shields.io/badge/java-17-blue.svg)](https://adoptopenjdk.net/)
+[![Java 21](https://img.shields.io/badge/java-21-blue.svg)](https://adoptopenjdk.net/)
 [![License](https://img.shields.io/badge/license-LGPL%202.1-blue.svg)](https://www.gnu.org/licenses/lgpl-2.1.html)
 [![Download](https://img.shields.io/github/v/release/eXist-db/exist.svg)](https://github.com/eXist-db/exist/releases/)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.exist-db/exist/badge.svg)](https://search.maven.org/search?q=g:org.exist-db)