ci(workflows): [lock-inactive-threads] add missing bot-token step

Signed-off-by: Lexus Drumgold <unicornware@flexdevelopment.llc>

Author: unicornware

.github/workflows/lock-inactive-threads.yml

@@ -2,6 +2,7 @@
 #
 # References:
 #
+# - https://github.com/actions/create-github-app-token
 # - https://github.com/dessant/lock-threads
 # - https://docs.github.com/actions/using-workflows/events-that-trigger-workflows#schedule
 
@@ -14,6 +15,12 @@ jobs:
   lock-inactive-threads:
     runs-on: ubuntu-latest
     steps:
+      - id: bot-token
+        name: Get bot token
+        uses: actions/create-github-app-token@v1.9.3
+        with:
+          app-id: ${{ secrets.BOT_APP_ID }}
+          private-key: ${{ secrets.BOT_PRIVATE_KEY }}
       - id: lock
         name: Lock inactive issues and pull requests
         uses: dessant/lock-threads@v5.0.1