Use Dyad github app for security advisory (#3088)

.github/workflows/github-security-advisory-alerts.yml

@@ -24,8 +24,8 @@ jobs:
         id: app-token
         uses: actions/create-github-app-token@v2
         with:
-          app-id: ${{ vars.KEPPO_GITHUB_APP_ID }}
-          private-key: ${{ secrets.KEPPO_GITHUB_APP_PRIVATE_KEY }}
+          app-id: ${{ vars.DYAD_GITHUB_APP_ID }}
+          private-key: ${{ secrets.DYAD_GITHUB_APP_PRIVATE_KEY }}
           # No permission-* scoping: repository_advisories is not yet
           # supported by create-github-app-token, so we inherit all
           # permissions from the App installation.