docs: OAS Changelog for 2025-10

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This PR contains the OAS changelog for the current month.

Changes were detected in the OAS repository and have been summarized in a new blog post.

---

[!NOTE] Adds a 2025-10-01 OAS changelog blog post and updates the last OAS commit pointer.

• Docs:
  • Blog post blog/251001-oas-updates.md summarizing OpenAPI changes dated 2025-10-01.
    • Codat-Spend-Insights: Modified endpoints:
      • /companies/{companyId}/reports/spendAnalysis/{reportId}/paymentMethods
      • /companies/{companyId}/reports/spendAnalysis/{reportId}/suppliers
• Infra:
  • Update .github/last_oas_check to latest OAS commit pointer.

^{Written by Cursor Bugbot for commit d407017f2a605fb1db53d4c6c7df2f917358578c. This will update automatically on new commits. Configure here.}

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Project	Deployment	Preview	Comments	Updated (UTC)
codat-docs	Ready	Preview	Comment	Oct 1, 2025 0:07am

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