Use stable pyo3 v0.21.1 release #116

	name: CodSpeed benchmarks

	on:
	push:
	branches:
	- "main"
	pull_request:
	workflow_dispatch: # allows CodSpeed to trigger backtest

	permissions:
	contents: read

	jobs:
	benchmarks:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.12" # use the latest version of Python because it is faster

	- name: Install python dependencies.
	run: pip install -r pytests/requirements.txt

	- name: Install rust stable.
	id: rust-toolchain
	uses: dtolnay/rust-toolchain@stable
	with:
	components: llvm-tools
	toolchain: stable

	- name: Cache rust.
	uses: Swatinem/rust-cache@v2

	- name: Compile.
	run: pip install -v -e .
	env:
	RUSTFLAGS: "-Cprofile-generate=${{ github.workspace }}/profdata"

	- name: Gather PGO data.
	run: pytest . --benchmark-enable

	- name: Prepare merged PGO data.
	run: rustup run stable bash -c '$RUSTUP_HOME/toolchains/$RUSTUP_TOOLCHAIN/lib/rustlib/x86_64-unknown-linux-gnu/bin/llvm-profdata merge -o ${{ github.workspace }}/merged.profdata ${{ github.workspace }}/profdata'

	- name: Compile with profile.
	run: pip install -v -e .
	env:
	RUSTFLAGS: "-Cprofile-use=${{ github.workspace }}/merged.profdata"

	- name: Run benchmarks.
	uses: CodSpeedHQ/action@v2
	with:
	token: ${{ secrets.CODSPEED_TOKEN }}
	run: pytest . --codspeed -n auto

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