Compile with Java 21

[mateuszkwiecinski]

No description provided.

[github-actions]

Apk size:

Aar size change: +0.0B (43.1KiB -> 43.1KiB)

Diffuse output:

OLD: diffuse-source-file-release
NEW: slidr-release.aar

 AAR      │ old      │ new      │ diff 
──────────┼──────────┼──────────┼──────
      jar │ 46.1 KiB │ 46.1 KiB │  0 B 
 manifest │    216 B │    216 B │  0 B 
      res │    153 B │    153 B │  0 B 
    other │    175 B │    175 B │  0 B 
──────────┼──────────┼──────────┼──────
    total │ 46.7 KiB │ 46.7 KiB │  0 B 

 JAR     │ old │ new │ diff      
─────────┼─────┼─────┼───────────
 classes │  27 │  27 │ 0 (+0 -0) 
 methods │ 288 │ 288 │ 0 (+0 -0) 
  fields │  73 │  73 │ 0 (+0 -0)