update CI for ubuntu 20.04 deprecation

Author: alex

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   mypy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -22,7 +22,7 @@ jobs:
         run: mypy --strict certifi
 
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python-version:
@@ -34,6 +34,7 @@ jobs:
         - "3.11"
         - "3.12"
         - "3.13"
+        - "3.14-dev"
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Set up Python ${{ matrix.python-version }}