Fix Git repository URL in Cargo.toml

Thanks for maintaining this grammar!

Author: wetneb

Cargo.toml

@@ -4,7 +4,7 @@ description = "gleam grammar for the tree-sitter parsing library"
 version = "1.0.0"
 keywords = ["incremental", "parsing", "gleam"]
 categories = ["parsing", "text-editors"]
-repository = "https://github.com/tree-sitter/tree-sitter-gleam"
+repository = "https://github.com/gleam-lang/tree-sitter-gleam"
 edition = "2018"
 license = "Apache-2.0"