fix: update tree-sitter-swift version to 0.7.1 for crates.io compatibility

Author: vinhnx

vtcode-core/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "vtcode-core"
-version = "0.1.0"
+version = "0.8.1"
 edition = "2024"
 authors = ["vinhnx <vinhnx@users.noreply.github.com>"]
 description = "Core library for VTCode - a Rust-based terminal coding agent"
@@ -100,5 +100,5 @@ default = []
 swift = ["tree-sitter-swift"]
 
 [dependencies.tree-sitter-swift]
-version = "=0.7.1"
+version = "0.7.1"
 optional = true