Fix PyGithub Auth.Token usage for newer API

[patilkishorv]

Fixing
/signoff-check:34: DeprecationWarning: Argument login_or_token is deprecated, please use auth=github.Auth.Token(...) instead
Noticed during NVIDIA/spark-rapids#14531

[greptile-apps]

Greptile Summary

This PR fixes a DeprecationWarning in PyGithub by replacing the deprecated positional login_or_token argument with the newer auth=Auth.Token(token) pattern, and adds the required Auth import. The copyright year is also updated to 2024-2026. The change is minimal, correct, and matches the PyGithub v2 migration guide.

Confidence Score: 5/5

Safe to merge — minimal, correct fix for a deprecation warning with no logic changes.

Single-file, two-line change that exactly follows the PyGithub v2 migration guide. No behavioral changes, no new risk introduced.

No files require special attention.

Important Files Changed

Filename	Overview
signoff-check/signoff-check	Replaces deprecated Github(token) positional arg with Github(auth=Auth.Token(token)); adds Auth import; updates copyright year.

Sequence Diagram

sequenceDiagram
    participant GHA as GitHub Actions
    participant Script as signoff-check
    participant PyGithub as PyGithub
    participant GHAPI as GitHub API

    GHA->>Script: Run with GITHUB_TOKEN
    Script->>PyGithub: Auth.Token(token)
    PyGithub-->>Script: auth object
    Script->>GHAPI: Github(auth=auth).get_repo().get_pull()
    GHAPI-->>Script: PR commits
    Script->>Script: Check SIGNOFF_REGEX
    Script-->>GHA: exit 0 (signoff found) / exit 1 (not found)

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_{Reviews (4): Last reviewed commit: "Signing" | Re-trigger Greptile}