[Core] Update the vendored cloudpickle version (#51322)

Signed-off-by: Jiajun Yao <jeromeyjj@gmail.com>

Author: jjyao

python/ray/cloudpickle/README.md

@@ -3,4 +3,5 @@
 
 Right now, we will need to update the vendored cloudpickle manually. Here are the steps to do so:
 1. Overwrite the `cloudpickle.py` and `cloudpickle_fast.py` from the [upstream](https://github.com/cloudpipe/cloudpickle)
-2. Run performance benchmarks to validate no regression. (e.g. microbenchmark, scalability tests, etc.)
+2. Update the version in python/ray/cloudpickle/__init__.py
+3. Run performance benchmarks to validate no regression. (e.g. microbenchmark, scalability tests, etc.)

python/ray/cloudpickle/__init__.py

@@ -11,7 +11,7 @@
 # expose their Pickler subclass at top-level under the  "Pickler" name.
 Pickler = CloudPickler
 
-__version__ = '2.0.0'
+__version__ = '3.0.0'
 
 
 def _warn_msg(obj, method, exc):