fix: correct workflow filename reference for model regeneration

The workflow in apify-client-python is named manual_regenerate_models.yaml,
not regenerate_models.yaml.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vdusek

.github/workflows/openapi-ci.yaml

@@ -149,7 +149,7 @@ jobs:
                   GITHUB_TOKEN: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}
                   PR_NUMBER: ${{ github.event.pull_request.number }}
               run: |
-                  gh workflow run regenerate_models.yaml \
+                  gh workflow run manual_regenerate_models.yaml \
                       --repo apify/apify-client-python \
                       --field docs_pr_number="$PR_NUMBER" \
                       --field docs_workflow_run_id="${{ github.run_id }}"
@@ -169,7 +169,7 @@ jobs:
               env:
                   GITHUB_TOKEN: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}
                   PR_NUMBER: ${{ github.event.pull_request.number }}
-              # Branch name convention must match what regenerate_models.yaml creates.
+              # Branch name convention must match what manual_regenerate_models.yaml creates.
               run: |
                   BRANCH="update-models-docs-pr-${PR_NUMBER}"
                   EXISTING_PR=$(gh pr list \