Fix wrong image for github action

Author: BrutalBirdie

.github/workflows/changelog_builder.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   release:
     if: startsWith(github.ref, 'refs/tags/')
-    runs-on: ubuntu-18.04-LTS
+    runs-on: ubuntu-latest
     steps:
       - name: Build Changelog
         id: github_release