fix(lib): use head fastnbt

Cargo.lock

···
 ]
 
 [[package]]
+name = "fastnbt"
+version = "2.5.0"
+source = "git+https://github.com/owengage/fastnbt#e2a5d8a7001d4f074ae99fd21bb485667934baeb"
+dependencies = [
+ "byteorder",
+ "cesu8",
+ "serde",
+ "serde_bytes",
+]
+
+[[package]]
 name = "fastrand"
 version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
···
 dependencies = [
  "color-eyre",
  "eframe",
- "fastnbt",
+ "fastnbt 2.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "mimalloc",
  "rfd",
  "slimeball-lib",
···
 version = "0.1.0"
 dependencies = [
  "byteorder",
- "fastnbt",
+ "fastnbt 2.5.0 (git+https://github.com/owengage/fastnbt)",
  "serde",
  "thiserror 2.0.15",
  "tracing",

slimeball-lib/Cargo.toml

···
 
 [dependencies]
 byteorder = "1.5.0"
-fastnbt = "2.5.0"
+fastnbt = { git = "https://github.com/owengage/fastnbt" }
 serde = "1.0.219"
 thiserror = "2.0.12"
 tracing = "0.1.41"