Fix abstract method signature error (#16809) #1

	name: Core Typecheck

	on:
	push:
	branches:
	- main
	pull_request:

	env:
	POETRY_VERSION: "1.8.3"

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	# You can use PyPy versions in python-version.
	# For example, pypy-2.7 and pypy-3.8
	matrix:
	python-version: ["3.9"]
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: ${{ github.event_name == 'pull_request' && 2 \|\| 0 }}
	- name: Install Poetry
	run: pipx install poetry==${{ env.POETRY_VERSION }}
	- name: Set up python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: "poetry"
	cache-dependency-path: "**/poetry.lock"
	- name: Install core
	shell: bash
	run: cd ./llama-index-core/ && poetry install --with dev
	- name: Run MyPy
	shell: bash
	run: cd ./llama-index-core/ && poetry run mypy llama_index

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