fix: use already imported instrument_hooks module for current_timestamp

Author: GuillaumeLagrange

src/pytest_codspeed/instruments/hooks/__init__.py

@@ -86,12 +86,9 @@ def set_executed_benchmark(self, uri: str, pid: int | None = None) -> None:
         if ret != 0:
             warnings.warn("Failed to set executed benchmark", RuntimeWarning)
 
-    @staticmethod
-    def current_timestamp() -> int:
+    def current_timestamp(self) -> int:
         """Return a monotonic timestamp in nanoseconds from the native library."""
-        from . import dist_instrument_hooks  # type: ignore
-
-        return dist_instrument_hooks.instrument_hooks_current_timestamp()
+        return self._module.instrument_hooks_current_timestamp()
 
     def add_marker(
         self, marker_type: int, timestamp: int, pid: int | None = None