drop support for python 3.7

Author: sebastianMindee

pyproject.toml

@@ -13,7 +13,6 @@ readme = "README.md"
 license = {file = "LICENSE"}
 classifiers = [
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.7",
   "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
@@ -27,7 +26,7 @@ classifiers = [
   "License :: OSI Approved :: MIT License",
 ]
 
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 
 dependencies = [
   "pypdfium2>=4.0,<4.30.1",