feat: use double quotes for echo

Author: swimmwatch

.github/workflows/check-update.yml

@@ -34,13 +34,13 @@ jobs:
               tz: UTC
               github_issue:
                 enabled: true
-                owner: '${{ github.repository_owner }}'
-                repo: '${{ github.event.repository.name }}'
-                token: '${{ secrets.GITHUB_TOKEN }}'
-                format_dt: '%Y-%m-%d'
-                title: 'Telegram Mini App documentation update: {dt}'
+                owner: "${{ github.repository_owner }}"
+                repo: "${{ github.event.repository.name }}"
+                token: "${{ secrets.GITHUB_TOKEN }}'
+                format_dt: "%Y-%m-%d"
+                title: "Telegram Mini App documentation update: {dt}"
                 assignees: 
-                  - 'swimmwatch'
+                  - "swimmwatch"
                 format_content: |
                   ```diff
                   {content}