[Resolver] [bug] pip dependency conflict error: pytest version conflict with openhands-resolver

[neubig]

Description:

Encountered a dependency resolution error when attempting to install packages listed in requirements.txt. The conflict arises due to incompatible versions of pytest required by openhands-resolver and pytest-mock.

Error Output:
See full logs here...

...
Collecting pandas<3.0.0,>=2.2.3 (from openhands-resolver==0.3.0->-r requirements.txt (line 7))
  Downloading pandas-2.2.3-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.metadata (89 kB)
INFO: pip is looking at multiple versions of openhands-resolver to determine which version is compatible with other requirements. This could take a while.
ERROR: Cannot install -r requirements.txt (line 5), -r requirements.txt (line 7) and pytest==8.2.1 because these package versions have conflicting dependencies.

The conflict is caused by:
    - The user requested pytest==8.2.1
    - pytest-mock 3.14.0 depends on pytest>=6.2.5
    - openhands-resolver 0.3.0 depends on pytest<9.0.0 and >=8.3.3

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts

Steps to Reproduce:

1. Copy this workflow file
2. Observe the dependency resolution error and conflicting package requirements after running OpenHands resolver from a GitHub issue.

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Moved from All-Hands-AI/openhands-resolver#329

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