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pip 20.0.2 does not support relative paths for cache dir

pip 20.0.2 does not support relative paths for cache dir: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). In this PR pip starts relying on path normalization outside of WheelCache class, while it is still being instantiated manually by pip-tools without path normalization…

The task

In this PR pip starts relying on path normalization outside of WheelCache class, while it is still being instantiated manually by pip-tools without path normalization. Using normalized path should be backward compatible with older versions of pip as well, so it should be safe…

Part of XiaomiMiMo/MiMo-V2.6-RL-oss.