Releases and security

Chore — runique (dependencies, toolchain)

• SeaORM bumped to 2.0.0-rc.40 and MSRV raised to Rust 1.94: updated sea-orm / sea-orm-migration from rc.38 to the pinned =2.0.0-rc.40. The new release candidate raises its minimum supported Rust version, so the workspace rust-version is bumped to 1.94 accordingly.