chore(deps): update dependency openai to v7.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
openai	7.7.0 → 7.8.0

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Release Notes

openai/openai-node (openai)

v7.8.0

Compare Source

Features

• api: add compute_units to Responses and Chat Completions usage (#​2505) (f9b1313)
• api: add default WebSocket User-Agent and audit log events (#​2504) (9b2f089)

Bug Fixes

• auth: clamp the workload-identity refresh buffer to the token lifetime (#​2490) (76b73a9)
• auth: secure first-class X.509 workload credentials (#​2479) (1b36c19)
• deps: harden dependency and release boundaries (#​2484) (b21ff45)
• events: settle WebSocket waiters when listeners throw (#​2491) (b5a13a7)
• restore native browser ESM imports (#​2495) (c8cab1e)
• uploads: detect multipart bodies from own properties only (#​2492) (559ffc8)

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