ci: update workflow secrets for token and telegram thread ID

Update GH_TOKEN to use MY_GITHUB_TOKEN secret and replace TELEGRAM_MESSAGE_THREAD_ID with TELEGRAM_TOPIC_ID_GKI for better security and clarity

.github/workflows/main.yml

@@ -112,7 +112,7 @@ jobs:
       - build-kernels-a14-6-1
       - build-kernels-a15-6-6
     env:
-      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      GH_TOKEN: ${{ secrets.MY_GITHUB_TOKEN }}
       RELEASE_NAME: "GKI Kernels With WKSU & SUSFS v1.5.9"
       RELEASE_BODY:
     steps:
@@ -258,7 +258,7 @@ jobs:
         run: |
           curl -X POST "https://api.telegram.org/bot${{ secrets.TELEGRAM_BOT_TOKEN }}/sendMessage" \
             -F chat_id="${{ secrets.TELEGRAM_CHAT_ID }}" \
-            -F message_thread_id="${{ secrets.TELEGRAM_MESSAGE_THREAD_ID }}" \
+            -F message_thread_id="${{ secrets.TELEGRAM_TOPIC_ID_GKI }}" \
             -F text="
             🌽 *New Kernel Release Uploaded*  
             📦 *Repository:* [${{ github.repository }}](https://github.com/${{ github.repository }})