Pins python version of pre-commmit.yaml workflow

[hhansen-bdai]

Description

pre-commit CI runs have been failing (see example) due to an incompatibility between our specified flake version and python 3.14, as python3.14 has started to be installed by the setup-python GHA. This PR pins python to 3.12 in order to fix these failures.

Type of change

• Bug fix (non-breaking change which fixes an issue)

[greptile-apps]

Greptile Overview

Greptile Summary

Fixes failing pre-commit CI runs by pinning Python version to 3.12 in the GitHub Actions workflow.

• Added python-version: "3.12" parameter to actions/setup-python@v3 step
• Addresses incompatibility between flake8 7.0.0 (specified in .pre-commit-config.yaml) and Python 3.14
• Previously, setup-python@v3 defaulted to latest Python version (3.14), which caused pre-commit failures
• Python 3.12 is compatible with all pre-commit hooks and aligns with the project's Python version usage in other workflows

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change is minimal, well-scoped, and directly addresses a documented CI failure. Pinning Python to 3.12 is a safe choice that aligns with other workflows in the repository (license-check uses 3.11, docs uses 3.11) and ensures compatibility with flake8 7.0.0.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
.github/workflows/pre-commit.yaml	5/5	Pinned Python to 3.12 to fix flake8 7.0.0 incompatibility with Python 3.14

Sequence Diagram

sequenceDiagram
    participant PR as Pull Request
    participant GHA as GitHub Actions
    participant Setup as setup-python@v3
    participant PreCommit as pre-commit/action
    participant Flake8 as flake8 7.0.0
    
    PR->>GHA: Trigger workflow (opened/sync/reopen)
    GHA->>Setup: Install Python
    Note over Setup: Without version: installs latest (3.14)
    Note over Setup: With version "3.12": installs 3.12
    Setup->>GHA: Python environment ready
    GHA->>PreCommit: Run pre-commit hooks
    PreCommit->>Flake8: Execute flake8 linting
    alt Python 3.14 (before fix)
        Flake8->>PreCommit: ❌ Incompatibility error
        PreCommit->>GHA: Workflow fails
    else Python 3.12 (after fix)
        Flake8->>PreCommit: ✓ Linting complete
        PreCommit->>GHA: Workflow succeeds
    end

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[github-actions]

Test Results Summary

2 669 tests   2 207 ✅  2h 27m 26s ⏱️
   99 suites    461 💤
    1 files        1 ❌

For more details on these failures, see this check.

Results for commit 6506a89.

[Mayankm96]

Does Isaac Sim 5.1 use Python 3.12 or 3.11? Might make sense to keep the version similar to that?

[d-kleine]

Yeah, IsaacSim requires Python 3.11, other versions don't work:
https://docs.isaacsim.omniverse.nvidia.com/latest/installation/install_python.html

From my point-of-view, this needs to be fixed. Tagging @hhansen-bdai for heads-up