v2.12.5: Safety Pin

This is a point release to pin the MCP SDK below 1.17, which introduced a change that is affecting some FastMCP users who 1) are using FastMCP auth providers and 2) are mounting their MCP servers as part of a larger application, resulting in the .well-known payload appearing in an unexpected location.

The only change in this release is pinning the SDK version: dab2b31

Full Changelog: v2.12.4...v2.12.5