Fix CHANGELOG space errors (#1647)

Author: cartermckinnon

.github/workflows/update-changelog.yaml

@@ -43,7 +43,9 @@ jobs:
               throw new Error(`changelog already includes ${release.data.name}`);
             }
             const newEntry = `# ${release.data.name}\n${release.data.body}`;
-            const updatedChangelog = changelog.replace(placeholder, placeholder + '\n\n' + newEntry + '\n---\n');
+            let updatedChangelog = changelog.replace(placeholder, placeholder + '\n\n' + newEntry + '\n---\n');
+            // if the release notes are modified in the GitHub web editor, trailing spaces can be added accidentally
+            updatedChangelog = updatedChangelog.replace(/\s+$/, '');
             fs.writeFileSync(changelogPath, updatedChangelog);
       - uses: peter-evans/create-pull-request@v4
         with: