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Fix pre-existing CPU downgrade resolver conflict #490

Description

@ChrisRackauckas-Claude

Summary

The downgrade test lane fails on clean master independently of #489.

Reproduction

At clean master commit b4825a09265d09cac0c8b76e5c6413e4ee0fc9cc, run the repository's Julia 1.10 downgrade test command:

import Pkg; Pkg.test(; coverage=true, julia_args=["--check-bounds=yes", "--compiled-modules=yes", "--depwarn=yes"], force_latest_compatible_version=false, allow_reresolve=false)

The resolver fails before tests run with:

Unsatisfiable requirements detected for package ForwardDiff
ForwardDiff is pinned to 1.0.1 by the downgrade environment
OrdinaryDiffEqRosenbrock 2 with LinearSolve 5.2.0 requires ForwardDiff >= 1.3.3

The parent commit also fails, through a separate LinearSolve 5.0 / DifferentiationInterface conflict, so this is not introduced by PR #489.

Impact

The CPU downgrade check is red on master and on the compat-only PR. The fix should be made in the downgrade floor/pinning logic or the relevant package compat constraints, separately from the SciMLTesting declaration.

Evidence: https://github.com/SciML/DiffEqGPU.jl/actions/runs/31882516251/job/95006963475

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