images_to_pdf.py

from pathlib import Path
from PIL import Image

# get all png images from folder `gotoslides`
SLIDES_IMAGES = Path("gotoslides").glob("*.png")

# maybe use a generator | convert RGB (since its png)
images = [Image.open(image).convert("RGB") for image in SLIDES_IMAGES]

with open("gotoslides.pdf", "wb") as pdf_file:

    first_image, *rest_images = images
    first_image.save(
        pdf_file, "PDF", resolution=100, save_all=True, append_images=rest_images
    )