fix(ci): fix YAML syntax error in hotfix-branch-creation workflow

Fixed line 168 syntax error caused by sed command with backslash continuation.

Replaced:

  sed -i "1 a\\\

  \\

  $HOTFIX_ENTRY" "$CHANGELOG_PATH"

With simpler approach:

  - Extract title line

  - Extract body

  - Reconstruct file with hotfix entry inserted

This avoids YAML parsing issues with backslash escaping.

.github/workflows/hotfix-branch-creation.yml

@@ -172,10 +172,13 @@ jobs:
 
 "
             
-            # Insert after the first line (title)
-            sed -i "1 a\\
-\\
-$HOTFIX_ENTRY" "$CHANGELOG_PATH"
+            # Insert after the first line (title) using a temp file
+            TITLE=$(head -n 1 "$CHANGELOG_PATH")
+            BODY=$(tail -n +2 "$CHANGELOG_PATH")
+            echo "$TITLE" > "$CHANGELOG_PATH"
+            echo "" >> "$CHANGELOG_PATH"
+            echo "$HOTFIX_ENTRY" >> "$CHANGELOG_PATH"
+            echo "$BODY" >> "$CHANGELOG_PATH"
             
             echo "✅ Added CHANGELOG entry for hotfix $HOTFIX_VERSION"
           else