Bump ajv and @modelcontextprotocol/sdk

Bumps [ajv](https://github.com/ajv-validator/ajv) to 8.18.0 and updates ancestor dependency [@modelcontextprotocol/sdk](https://github.com/modelcontextprotocol/typescript-sdk). These dependencies need to be updated together.


Updates `ajv` from 6.12.6 to 8.18.0
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v6.12.6...v8.18.0)

Updates `@modelcontextprotocol/sdk` from 1.17.4 to 1.26.0
- [Release notes](https://github.com/modelcontextprotocol/typescript-sdk/releases)
- [Commits](modelcontextprotocol/typescript-sdk@1.17.4...v1.26.0)

---
updated-dependencies:
- dependency-name: ajv
  dependency-version: 8.18.0
  dependency-type: indirect
- dependency-name: "@modelcontextprotocol/sdk"
  dependency-version: 1.26.0
  dependency-type: direct:production
...

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Author: dependabot[bot]