Upgrade to github-changelog-generator 0.0.12

Closes gh-489

Author: snicoll

.github/actions/create-github-release/action.yml

@@ -15,7 +15,7 @@ runs:
   using: composite
   steps:
     - name: Generate Changelog
-      uses: spring-io/github-changelog-generator@185319ad7eaa75b0e8e72e4b6db19c8b2cb8c4c1 #v0.0.11
+      uses: spring-io/github-changelog-generator@86958813a62af8fb223b3fd3b5152035504bcb83 #v0.0.12
       with:
         milestone: ${{ inputs.milestone }}
         token: ${{ inputs.token }}