Fix packaging: correct src/core layout and setuptools config

PKGBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Stu Leak <leaktechnologies@proton.me>
 
 pkgname=img2pdf
-pkgver=1.0.1
+pkgver=1.0.2
 pkgrel=1
 pkgdesc="Convert a single image or a folder of images to a PDF (sorted by filename)."
 arch=('any')

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "img2pdf"
-version = "1.0.1"
+version = "1.0.2"
 description = "Convert a single image or folder of images into a PDF (sorted by filename)."
 readme = "README.md"
 requires-python = ">=3.8"
@@ -19,5 +19,6 @@ Issues = "https://git.leaktechnologies.dev/stu/img2pdf/issues"
 [project.scripts]
 img2pdf = "core.__main__:main"
 
-[tool.setuptools.packages.find]
-where = ["src"]
+[tool.setuptools]
+package-dir = {"" = "src"}
+packages = ["core"]