pin idl to 1.5.9

Signed-off-by: Kevin Su <pingsutw@apache.org>

Author: pingsutw

setup.py

@@ -29,7 +29,7 @@
     },
     install_requires=[
         "googleapis-common-protos>=1.57",
-        "flyteidl>=1.5.9,<1.6.0",
+        "flyteidl==1.5.9",
         "wheel>=0.30.0,<1.0.0",
         "pandas>=1.0.0,<2.0.0",
         "pyarrow>=4.0.0,<11.0.0",