chore(ci): Use correct token for openapi version autobump (#2296)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Low Risk**
> Low risk CI-only change; it only affects how the workflow
authenticates for checkout/commits and could fail if the secret is
misconfigured.
> 
> **Overview**
> Updates the OpenAPI version bump GitHub Action to authenticate
`actions/checkout` using `secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN`
instead of relying on workflow `contents: write` permissions, ensuring
the autobump can push commits with the intended token.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
d412156. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Pijukatel

.github/workflows/bump-openapi-version.yaml

@@ -11,11 +11,11 @@ jobs:
     bump-version:
         name: Bump OpenAPI version
         runs-on: ubuntu-latest
-        permissions:
-            contents: write
 
         steps:
             - uses: actions/checkout@v6
+              with:
+                  token: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}
 
             - name: Bump OpenAPI version
               run: echo "v2-$(date -u +%Y-%m-%dT%H%M%SZ)" > apify-api/openapi/components/version.yaml