Miss match between coverage tool attribute type between single_version_platform_override and python_repository

[ewianda]

🐞 bug report

Is this a regression?

No

Description

https://github.com/bazelbuild/rules_python/blob/50a9a2e59d98c56a26b1b9230609d16723037c46/python/private/python.bzl#L817-L821
https://github.com/bazelbuild/rules_python/blob/50a9a2e59d98c56a26b1b9230609d16723037c46/python/private/python_repository.bzl#L274

🔬 Minimal Reproduction

python.single_version_platform_override(
    coverage_tool = "//benchsci/devtools/python:coverage_main",
    platform = "x86_64-unknown-linux-gnu",
    python_version = "3.11.6",
)

🔥 Exception or Error

Computing main repo mapping:
ERROR: <builtin>: @@rules_python~//python/extensions:rules_python~~python~python_3_11_6_x86_64-unknown-linux-gnu: expected value of type 'string' for attribute 'coverage_tool' in 'python_repository' rule, but got Label("//benchsci/devtools/python:coverage_main") (Label)
ERROR: Traceback (most recent call last):
 File "/home/ewianda/.cache/bazel/_bazel_ewianda/da4b4cc49e0e621570c9e24d6f1eab95/external/rules_python~/python/private/python.bzl", line 232, column 75, in _python_impl
loaded_platforms[full_python_version] = python_register_toolchains(
File "/home/ewianda/.cache/bazel/_bazel_ewianda/da4b4cc49e0e621570c9e24d6f1eab95/external/rules_python~/python/private/python_register_toolchains.bzl", line 133, column 26, in python_register_toolchains
python_repository(
Error in repository_rule: failed to instantiate 'python_repository' from this module extension
ERROR: @rules_python//python/config_settings:bootstrap_impl :: Error loading option @rules_python//python/config_settings:bootstrap_impl: error evaluating module extension python in @@rules_python~//python/extensions:python.bzl    

[rickeylev]

I ran across this code this evening. The doc string of the python_repository.coverage_tool attribute say it's intentionally a string. My guess is what's missing is python.bzl needs to call str() on the Label before it passes it along.