Update Rust crate octocrab to 0.49

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
octocrab	workspace.dependencies	minor	0.48 -> 0.49

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Release Notes

XAMPPRocky/octocrab (octocrab)

v0.49.3

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Added

• Http caching & Conditional requests (#​831)

v0.49.2

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Added

• Add body_text and body_html to Comment model (#​832)

v0.49.1

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Added

• provide expiration-aware installation token APIs (#​837)

Fixed

• Send body for retried requests (#​842)

v0.49.0

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Fixed

• [breaking] add a cfg to make the crypto backend for jwt configurable (#​834)
• incorrect path for followers and followees (#​829)

Other

• fix various warnings in CI and deny warnings being reintroduced (#​839)
• [breaking] mark more structs as #[non_exhaustive] (#​840)
• Partial implementation of Organization CoPilot APIs (#​747)
• [codes-of-conduct] #​527 (#​833)

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