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46bf420e - Allow upgrading prerelease versions of the same minor Python version (#15959)

Allow upgrading prerelease versions of the same minor Python version (#15959) Turns out if the minor versions matched we returned false from `is_upgrade_of` instead of continuing to compare prerelease versions. Closes #15955. Note: test cases were initially generated by Claude - I tried making them shorter. ## Test plan ``` ❯ cargo run -- -v python upgrade 3.14 [...] DEBUG Inspecting existing executable at `/Users/zsol/.local/bin/python3.14` DEBUG Replacing existing executable for `cpython-3.14.0rc2-macos-aarch64-none` at `/Users/zsol/.local/bin/python3.14` with executable for `cpython-3.14.0rc3-macos-aarch64-none` since it is an upgrade DEBUG Updated executable at `/Users/zsol/.local/bin/python3.14` to cpython-3.14.0rc3-macos-aarch64-none Installed Python 3.14.0rc3 in 5.04s + cpython-3.14.0rc3-macos-aarch64-none (python3.14) [...] ❯ uvx python3.14 -V Python 3.14.0rc3 ```