chore(deps): update plugin com.gradleup.shadow to v9 (#24)

In addition to `module-info.class` not being generated since upgrading 
to shadow 7x, there is now a new line (`Multi-Release: true`) in 
`META-INF/MANIFEST.MF` and no more `META-INF/versions` folder.

Details:
```
diff -r ../ASYNCSUPPORT_JARS/TicketBot-1.0-SNAPSHOT-all-NO-MAINTENANCE/META-INF/MANIFEST.MF ../ASYNCSUPPORT_JARS/TicketBot-1.0-SNAPSHOT-all-SHADOW-9x/META-INF/MANIFEST.MF
2a3
> Multi-Release: true
Only in ../ASYNCSUPPORT_JARS/TicketBot-1.0-SNAPSHOT-all-NO-MAINTENANCE/META-INF: versions
```

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle

@@ -1,7 +1,7 @@
 plugins {
     id 'java'
     id 'application'
-    id 'com.gradleup.shadow' version '8.3.9'
+    id 'com.gradleup.shadow' version '9.0.2'
     id 'io.freefair.lombok' version '6.5.1'
     id 'com.diffplug.spotless' version '7.2.1'
 }