BUG: Update pyproject.toml with minimum Python version of 3.8.

Closes py-pdf#2858.

.pylintrc

@@ -53,7 +53,7 @@ persistent=yes
 
 # Minimum Python version to use for version dependent checks. Will default to
 # the version used to run pylint.
-py-version=3.7
+py-version=3.8
 
 # Discover python modules and packages in the file system subtree.
 recursive=no

docs/user/installation.md

@@ -4,7 +4,7 @@ There are several ways to install pypdf. The most common option is to use pip.
 
 ## pip
 
-pypdf requires Python 3.7+ to run.
+pypdf requires Python 3.8+ to run.
 
 Typically Python comes with `pip`, a package installer. Using it you can
 install pypdf:

pyproject.toml

@@ -10,7 +10,7 @@ description = "A pure-python PDF library capable of splitting, merging, cropping
 readme = "README.md"
 dynamic = ["version"]
 license = { file = "LICENSE" }
-requires-python = ">=3.6"
+requires-python = ">=3.8"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
@@ -30,7 +30,6 @@ classifiers = [
 
 dependencies = [
     "typing_extensions >= 4.0; python_version < '3.11'",
-    "dataclasses; python_version < '3.7'",
 ]
 
 [project.urls]
@@ -41,13 +40,11 @@ Changelog = "https://pypdf.readthedocs.io/en/latest/meta/CHANGELOG.html"
 
 [project.optional-dependencies]
 full = [
-    "cryptography; python_version >= '3.7'",
-    "PyCryptodome; python_version == '3.6'",
+    "cryptography; python_version >= '3.8'",
     "Pillow>=8.0.0",
 ]
 crypto = [
-    "cryptography; python_version >= '3.7'",
-    "PyCryptodome; python_version == '3.6'",
+    "cryptography; python_version >= '3.8'",
 ]
 image = ["Pillow>=8.0.0"]
 dev = ["black", "pip-tools", "pre-commit<2.18.0", "pytest-cov", "pytest-socket", "pytest-timeout", "flit", "wheel", "pytest-xdist"]