Update dependencies and workflow

Add typing_extension dependency to support 3.8 and 3.9

3.7 could still be supported with older typing_extensions releases,
but it reached its EOL

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
       max-parallel: 2
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     # Needed for Linux

pyproject.toml

@@ -6,23 +6,28 @@ build-backend = "setuptools.build_meta"
 name = "PDFMetadataEditor"
 version = "0.3"
 authors = [
-  { name="Andrea Pachera" },
-  { name="Gianmarco Brocchi", email="[email protected]" },
-  { name="Michele Mastropietro", email="[email protected]" },
+  { name = "Andrea Pachera" },
+  { name = "Gianmarco Brocchi", email = "[email protected]" },
+  { name = "Michele Mastropietro", email = "[email protected]" },
 ]
 description = "A simple GUI to edit the PDF metadata"
 readme = "README.md"
-requires-python = ">=3.10"
+requires-python = ">=3.8"
 classifiers = [
-    "Programming Language :: Python :: 3",
-    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
-    "Operating System :: OS Independent",
+  "Programming Language :: Python :: 3",
+  "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+  "Operating System :: OS Independent",
 ]
 
-dependencies = ["PyQt6", "pypdf", "pypdf[crypto]"]
+dependencies = [
+  "typing_extensions >= 4.8; python_version < '3.10'",
+  "PyQt6 >= 6.5.2",
+  "pypdf >= 3.16.2",
+  "pypdf[crypto]",
+]
 
 [tool.setuptools]
-package-dir = {"" = "src"}
+package-dir = { "" = "src" }
 
 [project.urls]
 "Homepage" = "https://github.com/Manitary/PDF-Metadata-Editor"