chore: upgrade dependencies (202608)

[mzanoni]

https://trello.com/c/haAtkhii/21403-recurring-task-development-js-sdk-check-package-dependencies

Summary

• Upgrade @types/node from 26.1.2 to 26.2.0, @typescript-eslint/parser from 8.65.0 to 8.67.0, and eslint from 10.8.0 to 10.8.1 in packages/client, packages/integrations, and packages/code-analyzer.
• Retain TypeScript 6.0.3 because TypeScript 7.0.2 is incompatible with the current Rollup TypeScript plugin (Cannot read properties of undefined (reading 'ES2015')).
• Keep fixed-skip swagger-typescript-api at 12.0.4. npm recommends 13.12.6 to resolve its high-severity advisories, but that major upgrade requires a dedicated generator/template migration.

Risk

• Low: development-tooling and type-definition updates only; runtime dependencies and generated SDK contracts are unchanged.

Validation

• packages/client: npm run gen-api passed; generated contract drift restored; npm run build passed; npm test passed (13 suites, 69 tests).
• packages/integrations: npm run build passed; npm test passed (1 suite, 2 tests).
• packages/code-analyzer: npm run lint passed.
• Integration tests: not run because credentials are unavailable; no runtime behavior or API contract changes were made.

Notes

• No comparator-range dependencies were present.
• Client npm audit reports four high-severity findings through the fixed-skip Swagger generator dependency tree.