[MSHADE-426] Shade remap chokes on Multi-Release-JARs prepped to support Java 19

**[Tamas Cservenak](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=cstamas)** opened **[MSHADE-426](https://issues.apache.org/jira/browse/MSHADE-426?redirect=false)** and commented

If JAR contains classes under `META-INF/versions/19` the shade goal fails.

```
Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 63
    at org.objectweb.asm.ClassReader. (ClassReader.java:199)
    at org.objectweb.asm.ClassReader. (ClassReader.java:180)
    at org.objectweb.asm.ClassReader. (ClassReader.java:166)
    at org.objectweb.asm.ClassReader. (ClassReader.java:287)
    at org.apache.maven.plugins.shade.DefaultShader.addRemappedClass (DefaultShader.java:543)
    at org.apache.maven.plugins.shade.DefaultShader.shadeJarEntry (DefaultShader.java:307)
    at org.apache.maven.plugins.shade.DefaultShader.shadeJars (DefaultShader.java:269)
    at org.apache.maven.plugins.shade.DefaultShader.shade (DefaultShader.java:128)
    at org.apache.maven.plugins.shade.mojo.ShadeMojo.execute (ShadeMojo.java:500)

```

---

**Issue Links:**
- [MSHADE-385](https://issues.apache.org/jira/browse/MSHADE-385) Support for Multi-Release-JARs

Start at DefaultShader.shadeJarEntry and DefaultShader.addRemappedClass, where the stack trace shows the failure while processing META-INF/versions/19. Reproduce the shade goal with a Multi-Release JAR containing Java 19 classes, then verify that shading completes without the ASM unsupported-class-version error.

Written by the indexing model from the issue text.