Update Rust crate octocrab to 0.40

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
octocrab	dependencies	minor	0.39 -> 0.40

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Release Notes

XAMPPRocky/octocrab (octocrab)

v0.40.0

Compare Source

Added

• Support remove_assignees on issue API (#​686)
• add missing fields in CreateForkBuilder (#​682)
• Add Gist::public field (#​678)

Fixed

• (refs) [breaking] remove Reference::Commit variant (#​697)

Other

• Fix typo in cfg_attr statement (#​693)
• Handle empty author object in pr_commits (#​656)
• Add DeviceCodes::poll_until_available method (#​679)
• Uncomment pr_commits function (#​680)
• Only add base_path if req_pandq does not contain it (#​684)
• Update code scanning alert (#​673)
• Added merged_by and closed_by fields (#​674)
• Update and Fixes to the Code Scanning Models & Webhooks (#​675)

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