build: increase minimum supported Python version to 3.10

Python 3.9 is not supported since 2025-10-31:
https://devguide.python.org/versions/

mypy just dropped support for Python 3.9:
<1a6ff59049>

.github/workflows/ci.yml

@@ -246,11 +246,11 @@ jobs:
           - os: macos-latest
             python: pypy3.10
 
-          # Minimum Supported Python Version = 3.8
+          # Minimum Supported Python Version = 3.10
           # This is the minimum version for which manylinux Python wheels are
           # built. Test it with minimum supported Rust version.
           - os: ubuntu-latest
-            python: 3.8
+            python: "3.10"
 
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
@@ -302,9 +302,9 @@ jobs:
           - os: macos-latest
             python: pypy3.10
 
-          # Minimum Supported Python Version = 3.8
+          # Minimum Supported Python Version = 3.10
           - os: ubuntu-latest
-            python: 3.8
+            python: "3.10"
 
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60

deltachat-rpc-client/pyproject.toml

@@ -13,8 +13,6 @@ classifiers = [
     "Operating System :: POSIX :: Linux",
     "Operating System :: MacOS :: MacOS X",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -24,7 +22,7 @@ classifiers = [
     "Topic :: Communications :: Email"
 ]
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 
 [tool.setuptools.package-data]
 deltachat_rpc_client = [

python/pyproject.toml

@@ -7,7 +7,7 @@ name = "deltachat"
 version = "2.28.0"
 description = "Python bindings for the Delta Chat Core library using CFFI against the Rust-implemented libdeltachat"
 readme = "README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 authors = [
     { name = "holger krekel, Floris Bruynooghe, Bjoern Petersen and contributors" },
 ]
@@ -23,7 +23,6 @@ classifiers = [
 dependencies = [
     "cffi>=1.0.0",
     "imap-tools",
-    "importlib_metadata;python_version<'3.8'",
     "pluggy",
     "requests",
 ]

scripts/run_all.sh

@@ -31,6 +31,6 @@ unset CHATMAIL_DOMAIN
 
 # Try to build wheels for a range of interpreters, but don't fail if they are not available.
 # E.g. musllinux_1_1 does not have PyPy interpreters as of 2022-07-10
-tox --workdir "$TOXWORKDIR" -e py38,py39,py310,py311,py312,py313,pypy38,pypy39,pypy310 --skip-missing-interpreters true
+tox --workdir "$TOXWORKDIR" -e py310,py311,py312,py313,pypy310 --skip-missing-interpreters true
 
 auditwheel repair "$TOXWORKDIR"/wheelhouse/deltachat* -w "$TOXWORKDIR/wheelhouse"