Bump actions/checkout from 5 to 6 (#16)

Author: dependabot[bot]

.github/workflows/update.yml

@@ -18,13 +18,13 @@ jobs:
           app_id: ${{ secrets.GH_APP_ID }}
           private_key: ${{ secrets.GH_APP_PRIVATE_KEY }}
       - name: Check out code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           token: ${{ steps.generate_token.outputs.token }}
           path: client-go
       - name: Check out code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: goauthentik/authentik
           token: ${{ steps.generate_token.outputs.token }}