Release prep: bump ModelingToolkit (root) to 11.31.2 (#4732)

Patch release covering safe, routine maintenance changes accumulated since
11.31.1 (commit 52cb07f): raised SciMLBase and OrdinaryDiffEqCore compat
floors for downgrade-CI correctness, Runic-formatted initialization
diagnostics (whitespace/literal-style only, no behavior change), TagBot
workflow update for monorepo-aware registration dispatch, and minor
docs/typo-config cleanup. No own new public API added, so patch bump.

lib/ModelingToolkitBase is NOT included in this release: its unreleased
diff (since 1.51.0 / commit 3b79461) mixes safe fixes (DiffEqBase compat
floor raise, two @nospecialize/build_function_wrapper internal fixes) with
PR #4601 "Add the homotopy operator and HomotopyProblem construction",
which adds a new exported `homotopy` operator, a new SciMLBase.HomotopyProblem
construction path, and changes to the shared generate_rhs/build_function_wrapper
codegen internals. That is genuine new public API surface needing maintainer
review before a routine release; flagged rather than bumped.

No compat-floor cascade is needed in this pass since no lib/* package is
being released.

Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

Author: ChrisRackauckas

Project.toml

@@ -1,6 +1,6 @@
 name = "ModelingToolkit"
 uuid = "961ee093-0014-501f-94e3-6117800e7a78"
-version = "11.31.1"
+version = "11.31.2"
 authors = ["Yingbo Ma <mayingbo5@gmail.com>", "Chris Rackauckas <accounts@chrisrackauckas.com> and contributors"]
 
 [deps]