CompatHelper: bump compat for ModelingToolkit to 11, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the ModelingToolkit package from 9 to 9, 11.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[ChrisRackauckas-Claude]

ModelingToolkit v11 Compatibility Fix Required

I've analyzed this PR and identified a breaking change that needs to be addressed for ModelingToolkit v11 compatibility.

Issue

ModelingToolkit v11.0.0 (released December 11, 2024) removed the get_defaults function as part of a redesign of the initialization system. The concept of "defaults" has been replaced with initial_conditions and bindings.

Required Changes

Two test files import get_defaults but never use it. These imports need to be removed:

test/Reactor_tests/Jacket_test.jl (line 4):

-import ModelingToolkit: get_unknowns, get_observed, get_defaults, get_eqs, scalarize
+import ModelingToolkit: get_unknowns, get_observed, get_eqs, scalarize

test/Sources_tests/source_tests.jl (line 3):

-import ModelingToolkit: get_unknowns, get_observed, get_defaults, get_eqs
+import ModelingToolkit: get_unknowns, get_observed, get_eqs

Notes

• The imported get_defaults function is not actually called in any of the test files, so removing it is safe
• These are the only changes needed for v11 compatibility based on my analysis of the codebase
• The rest of the code uses ModelingToolkit APIs that remain compatible with v11

I attempted to push these fixes directly to the PR branch but don't have push permissions. These changes should allow CI to pass once applied.

cc @ChrisRackauckas

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