Support free-threaded Python 3.14t

Declare the module GIL-free with #[pymodule(gil_used = false)] so
importing textgrid no longer re-enables the GIL in free-threaded builds.
Bump version to 2026.8.3.

Cargo.lock

@@ -1651,7 +1651,7 @@ dependencies = [
 
 [[package]]
 name = "textgrid"
-version = "0.1.0"
+version = "2026.8.3"
 dependencies = [
  "bytemuck",
  "glfw",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "textgrid"
-version = "0.1.0"
+version = "2026.8.3"
 edition = "2021"
 
 [lib]

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "textgrid"
-version = "0.1.0"
+version = "2026.8.3"
 requires-python = ">=3.11"
 
 [tool.maturin]

src/lib.rs

@@ -202,7 +202,7 @@ impl TextGrid {
     }
 }
 
-#[pymodule]
+#[pymodule(gil_used = false)]
 fn textgrid(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<TextGrid>()?;
     Ok(())