Upgrade versions

[whywaita]

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[Copilot]

Pull request overview

This PR upgrades the go-github library from v47 to v80, updates Go from version 1.23 to 1.25, and pins GitHub Actions to specific commit SHAs. The upgrade includes adapting to API changes in the newer go-github version, such as switching from deprecated functions to new methods and updating type signatures.

Key Changes:

• Upgraded go-github from v47 to v80 across all Go source files
• Updated Go version from 1.23 to 1.25 in go.mod and Dockerfile
• Replaced deprecated github.String() with github.Ptr() and adapted to new API patterns
• Pinned all GitHub Actions to specific commit SHAs with version comments

Reviewed changes

Copilot reviewed 22 out of 26 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
go.mod	Updated Go version to 1.25 and upgraded dependencies including go-github to v80
Dockerfile	Updated base image to golang:1.25
pkg/gh/github.go	Replaced deprecated NewEnterpriseClient() with NewClient().WithEnterpriseURLs()
pkg/gh/jwt.go	Adapted token expiration handling to use GetTime() method
pkg/gh/runner.go	Updated ListOptions to ListRunnersOptions with nested structure
pkg/starter/starter.go	Replaced github.String() with github.Ptr()
internal/util/util.go	Switched from golang.org/x/exp/rand to math/rand/v2
.github/workflows/*.yaml	Pinned all GitHub Actions to specific commit SHAs

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