chore: bump version to 1.26.0

[pcarleton]

Bumps version to 1.26.0 for release.

Also fixes:

• Typecheck error in stateManagementStreamableHttp test (non-null assertions for optional setupServer fields)
• Prettier formatting issues in honoWebStandardStreamableHttp.ts and protocol-transport-handling.test.ts

[changeset-bot]

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Latest commit: 10f488d

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npm i https://pkg.pr.new/modelcontextprotocol/typescript-sdk/@modelcontextprotocol/sdk@1479

commit: 10f488d