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### What does this PR do? This PR safely bumps python version to 3.10 for two reasons: 1. [`removeprefix`](https://docs.python.org/3.9/whatsnew/3.9.html#new-string-methods-to-remove-prefixes-and-suffixes) was introduced in python 3.9588f9728f3/verl/single_controller/ray/base.py (L498-L505)
2. [`match`](https://docs.python.org/3.10/whatsnew/3.10.html#simple-pattern-match-to-a-literal) was introduced in python 3.10588f9728f3/verl/tools/utils/tool_registry.py (L81-L92)
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The standalone test folder is reserved for tests that require dedicated environment (e.g. memory stress tests)