chore(deps): update dependency phoenix to v1.8.6

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This PR contains the following updates:

Package	Type	Update	Change
phoenix (source)	prod	patch	1.8.5 → 1.8.6

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Release Notes

phoenixframework/phoenix (phoenix)

v1.8.6

Compare Source

Security fixes

• CVE-2026-32689: Fix Phoenix.Socket Longpoll transport memory exhaustion in nd-JSON body splitting

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