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

[github-actions]

This pull request changes the compat entry for the ModelingToolkit package from 9.72 to 9.72, 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]

CI Failure Analysis

The CI is failing because of an upstream dependency conflict, not code issues in this package.

Root Cause

• This PR adds ModelingToolkit 11 compatibility
• ReactionNetworkImporters requires Catalyst 15 (Catalyst = "15.0")
• Catalyst 15 only supports ModelingToolkit up to version 9 (ModelingToolkit = "9.73.0 - 9" in Catalyst's compat)
• There is no version of Catalyst that currently supports ModelingToolkit 11

Error from CI

Catalyst [479239e8] log:
├─restricted to versions 15 by ReactionNetworkImporters
└─restricted by compatibility requirements with ModelingToolkit to versions: uninstalled — no versions left

Resolution

This PR cannot be merged until Catalyst releases a version with ModelingToolkit 11 support. Once Catalyst adds MTK 11 compatibility, this PR should work without any code changes.

Recommendation

• Keep this PR open and wait for Catalyst to update
• Alternatively, remove MTK 11 from compat for now and re-add it once Catalyst supports it

cc @ChrisRackauckas

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