Remove all compat bounds from test/Project.toml

The compat bounds in test/Project.toml conflict with downgraded main
Project.toml deps during the Downgrade CI job. The original repo used
[extras]/[targets] without compat bounds for test deps. Removing compat
from test/Project.toml lets the main Project.toml compat (which gets
downgraded) control resolution without extra constraints.

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: claude

test/Project.toml

@@ -13,12 +13,3 @@ StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 Tracker = "9f7883ad-71c0-57eb-9f7f-b5c9e6d3789c"
 Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
-
-[compat]
-BenchmarkTools = "1.6.3"
-ForwardDiff = "1.3.1"
-InvertedIndices = "1.3.1"
-LabelledArrays = "1.17.0"
-OffsetArrays = "1.17.0"
-StaticArrays = "1.9.16"
-Unitful = "1.27.0"