fix: avoid RuntimeWarning from run_sync on tzdata install in pyodide (#2574)

Author: haakonvt

cognite/client/utils/_pyodide_helpers.py

@@ -19,6 +19,8 @@
 
 logger = logging.getLogger(__name__)
 
+_TASK_REF_TZDATA: object = None  # We need a global ref
+
 
 def patch_sdk_for_pyodide() -> None:
     # -------------------
@@ -65,10 +67,12 @@ def patch_sdk_for_pyodide() -> None:
     #   internally for e.g. datapoints and workflows.
     #   Note: This convenience will only work in chromium-based browsers (as of Sept 2025)
     try:
+        import asyncio
+
         import micropip  # type: ignore [import-not-found]
-        from pyodide.ffi import run_sync  # type: ignore [import-not-found]
 
-        run_sync(micropip.install("tzdata"))
+        global _TASK_REF_TZDATA  # keep the gc at bay
+        _TASK_REF_TZDATA = asyncio.create_task(micropip.install("tzdata"))
     except Exception:
         logger.debug(
             "Could not load 'tzdata' package automatically in pyodide. You may need to do this manually:"