Update the definition of `Handler` to utilize `App.Default`

[gcanti]

Type

• [x] Refactor
• [ ] Feature
• [ ] Bug Fix
• [ ] Optimization
• [ ] Documentation Update

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 0ecd81f13ecd0b13512fd7061bcb2cf99c9a151c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
@effect/platform	Patch
@effect/cli	Patch
@effect/experimental	Patch
@effect/platform-browser	Patch
@effect/platform-bun	Patch
@effect/platform-node-shared	Patch
@effect/platform-node	Patch
@effect/rpc-http	Patch
@effect/rpc	Patch
@effect/sql-mssql	Patch
@effect/sql-mysql2	Patch
@effect/sql-pg	Patch
@effect/sql-sqlite-bun	Patch
@effect/sql-sqlite-node	Patch
@effect/sql	Patch
@effect/sql-sqlite-react-native	Patch
@effect/sql-sqlite-wasm	Patch

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