CI: prevent Ubuntu 20.04 brownout

* actions/runner-images#11101

Author: g-andrade

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
           '1.17',
           '1.18'
         ]
-        os: ['ubuntu-20.04']
+        os: ['ubuntu-22.04']
     steps:
       - name: Checkout
         uses: actions/checkout@v4

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Changed
+
+- CI from Ubuntu 20.04 to 22.04
+
 ## [0.2.1] - 2025-02-06
 
 ### Added