Renovate bumps the CI Python past the numpy and pandas wheels it freezes

[aglinxinyuan]

What happened?

.github/renovate.json5 freezes numpy / pandas / pyarrow because they sit on the Arrow IPC data path and must move in lockstep. Nothing freezes the CI interpreter those wheels are selected for, so Renovate raised actions/setup-python's python-version: to 3.14 in #7715 and build / amber-integration broke on both runners.

The interpreter is downstream of the frozen pins — a Python version is only usable if the pinned packages publish a wheel for it:

Pin in amber/requirements.txt	Wheels published	cp314?
numpy==2.1.0	cp310–cp313	no
pandas==2.2.3	cp310–cp313	no
pyarrow==23.0.1	cp310–cp314	yes

With no cp314 wheel, uv falls back to a source build of numpy, which does not compile against the 3.14 headers.

Before:  Renovate bumps python-version -> 3.14 -> no numpy cp314 wheel
         -> uv source-builds numpy -> 11 compile errors -> job fails
After:   python-version frozen with the numpy/pandas pins
         -> prebuilt wheel resolves -> job installs as before

Renovate rewrites three standalone python-version: inputs:

Site	Job	Value on main
build.yml:401	amber-integration	3.11
build.yml:127	frontend	3.12
benchmarks.yml:217	Bench	3.12

The pyamber matrix at build.yml:1041 is ["3.11", "3.12", "3.13"] — a plain list Renovate never reads. So besides breaking the build, the bump silently splits the interpreter CI actually runs on from the matrix that is actually tested.

How to reproduce?

1. Open (or re-run) the Renovate github-actions group PR that carries the python uses-with bump — chore(deps, ci): update github-actions #7715.
2. build / amber-integration (ubuntu-latest, 17) and (macos-latest, 17) fail at the Install Python dependencies step.

Locally, on a 3.14 interpreter:

uv pip install --system --index-strategy unsafe-best-match -r amber/requirements.txt

Wheel availability can be confirmed straight from PyPI:

curl -s https://pypi.org/pypi/numpy/2.1.0/json | grep -o 'cp3[0-9][0-9]' | sort -u

Version/Branch

1.3.0-incubating-SNAPSHOT (main)

Commit Hash (Optional)

2f7e75e (head of #7715)

Relevant log output

Building pandas==2.2.3
Building numpy==2.1.0
  × Failed to build `numpy==2.1.0`
  ├─▶ The build backend returned an error
  ╰─▶ Call to `mesonpy.build_wheel` failed (exit status: 1)

      ../numpy/_core/src/umath/string_fastsearch.h:132:5: error: no type named
      'ptrdiff_t' in namespace 'std'; did you mean simply 'ptrdiff_t'?
        132 |     std::ptrdiff_t
            |     ^~~~~~~~~~~~~~
      ...
      11 errors generated.
      [253/324] Compiling C++ object
      numpy/_core/_multiarray_umath.cpython-314-darwin.so.p/src_umath_special_integer_comparisons.cpp.o
      ninja: build stopped: subcommand failed.
##[error]Process completed with exit code 1.