Prepare release 1.14 (#140)

* move to uppercase markdown filenames

* prepare release 1.14

Author: dzuelke

.github/workflows/check_changelog.yml

@@ -17,4 +17,4 @@ jobs:
       - name: Check that CHANGELOG is touched
         run: |
           git fetch origin ${{ github.base_ref }} --depth 1 && \
-          git diff remotes/origin/${{ github.base_ref }} --name-only | grep changelog.md
+          git diff remotes/origin/${{ github.base_ref }} --name-only | grep CHANGELOG.md

changelog.md renamed to CHANGELOG.md

@@ -5,6 +5,8 @@ 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] - YYYY-MM-DD
+
+## [1.14] - 2025-06-30
 ### Changes
 - Drop support for heroku-20
 - Update Nginx to 1.28.0