`install_reqs` propagates only `PIP` environment variables, not `UV` ones

[agriyakhetarpal]

pyodide-build/pyodide_build/pypabuild.py

Lines 264 to 268 in ce8e9d0

	# propagate PIP config from build_env to current environment
	with common.replace_env(
	os.environ | {k: v for k, v in build_env.items() if k.startswith("PIP")}
	):
	env.install(reqs)

This is an unrelated issue I discovered locally when reviewing #412.

We should pass all uv-based environment variables here as well