Bump negroni from v1.0.0 to v3.1.1 in /examples

[alexandear]

Negroni has been moved to https://github.com/urfave/negroni. The latest version is v3.

[Copilot]

Pull request overview

This PR updates the Negroni dependency from the deprecated github.com/codegangsta/negroni v1.0.0 to the current github.com/urfave/negroni/v3 v3.1.1. The Negroni project was moved to the urfave organization, and this update ensures the examples use the maintained version of the library.

Changes:

• Updated import path in negroni example from github.com/codegangsta/negroni to github.com/urfave/negroni/v3
• Updated go.mod to replace old dependency with new one at version v3.1.1
• Updated go.sum with corresponding checksums for the new dependency

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
examples/negroni/server.go	Updated import statement to use new negroni package path with v3 module
examples/go.mod	Removed old codegangsta/negroni dependency and added urfave/negroni/v3 v3.1.1
examples/go.sum	Removed checksums for old negroni package and added checksums for new v3.1.1 version

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