chore(deps): update dependency mcp-proxy to v5.12.5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
mcp-proxy (source)	5.9.0 → 5.12.5

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Release Notes

punkpeye/mcp-proxy (mcp-proxy)

v5.12.5

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Bug Fixes

• correct types path (e6d5058)

v5.12.4

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Bug Fixes

• correct entry path (ec13456)

v5.12.3

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Bug Fixes

• update semantic-release (000ac05)

v5.12.2

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Bug Fixes

• update dev dependencies (233818c)

v5.12.1

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Bug Fixes

• update dev dependencies (924dfde)

v5.12.0

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Features

• Add MCP scope challenge (step-up authentication) support (dc5f1ab)
• MCP 2025-11-25 (397f6d0)

v5.11.2

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Bug Fixes

• send SSE connection notice as notifications/message (0bb50c0)
• send SSE connection notice as notifications/message (91c5c03), closes #​33

v5.11.1

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Bug Fixes

• only register completions handler when server supports completions (1d51885)
• only register completions handler when server supports completions (2427516)

v5.11.0

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Features

• implement full RFC6750 support for www-authenticate headers (7b68c11)
• implement full RFC6750 support www-authenticate (cba77d7)

v5.10.0

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Features

• support cors config (3f3fe47)

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