Use full Python version for installed version (#1033)

## Summary

`interpreter.version()` returns the `python_full_version`, but the
marker variant uses `python_version` instead of `python_full_version` --
so it's omitting the patch.

crates/puffin-resolver/src/python_requirement.rs

@@ -16,7 +16,7 @@ impl PythonRequirement {
     pub fn new(interpreter: &Interpreter, markers: &MarkerEnvironment) -> Self {
         Self {
             installed: interpreter.version().clone(),
-            target: markers.python_version.version.clone(),
+            target: markers.python_full_version.version.clone(),
         }
     }