update CI for ubuntu 20.04 deprecation (#348)

* update CI for ubuntu 20.04 deprecation

* Update setup.py

* Update ci.yml

.github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1ba5f7e..b37ddd6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@
 
 jobs:
   mypy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -22,11 +22,10 @@
         run: mypy --strict certifi
 
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python-version:
-        - "3.6"
         - "3.7"
         - "3.8"
         - "3.9"
@@ -34,6 +33,7 @@
         - "3.11"
         - "3.12"
         - "3.13"
+        - "3.14-dev"
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Set up Python ${{ matrix.python-version }}

setup.py

diff --git a/setup.py b/setup.py
index 50ddd9f..f3a1763 100755
--- a/setup.py
+++ b/setup.py
@@ -36,11 +36,10 @@
     ],
     package_dir={"certifi": "certifi"},
     package_data={"certifi": ["*.pem", "py.typed"]},
-    # data_files=[('certifi', ['certifi/cacert.pem'])],
     include_package_data=True,
     zip_safe=False,
     license="MPL-2.0",
-    python_requires=">=3.6",
+    python_requires=">=3.7",
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
@@ -49,7 +48,6 @@
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",