fix(ci): deck integration tests checkout secret

The checkout step of these tests was using a secret that is not
available to PRs opened from forks, which made it fail.
This commit removes the token (not needed in CE), which makes the action
fall back to the default github token.

It also adds the workflow to the `paths`, just to make sure it runs when
modified.

.github/workflows/deck-integration.yml

@@ -8,6 +8,7 @@ on:
     - 'kong/plugins/**/daos.lua'
     - 'kong/db/dao/*.lua'
     - 'kong/api/**/*.lua'
+    - '.github/workflows/deck-integration.yml'
 
 permissions:
   pull-requests: write
@@ -53,7 +54,6 @@ jobs:
         uses: actions/checkout@v4
         with:
           submodules: recursive
-          token: ${{ secrets.GHA_KONG_BOT_READ_TOKEN }}
 
       - name: Lookup build cache
         id: cache-deps