Fix entry format for public changelog (#669)

Remove extra empty lines around changelog content.

[skip changelog]
[skip review]

Author: tombruijn

.github/workflows/create_release_from_tag.yml

@@ -39,12 +39,11 @@ jobs:
           # Use sed to remove everything after "-----BEGIN PGP SIGNATURE-----" if it's present
           # and also always remove the last line of the git show output
           git show --format=oneline --no-color --no-patch "${{ env.TAG_NAME }}" \
-          | sed '1,2d' \
+          | sed '1,3d' \
           | sed '$d' \
           | sed '/-----BEGIN PGP SIGNATURE-----/,$d' \
           > CHANGELOG_TEXT.txt
 
-          echo "" >> CHANGELOG_TEXT.txt
           echo "" >> CHANGELOG_TEXT.txt
 
           export PACKAGE_PATH="${{ env.PACKAGE_PATH }}"