Remove redundant SciMLBase test dependencies

The SciMLBase package is already available in test sub-environments via
Pkg.develop() calls in runtests.jl (lines 10 and 16), making explicit
dependencies in test Project.toml files redundant.

Changes:
- Remove SciMLBase dependency from test/downstream/Project.toml
- Remove SciMLBase dependency from test/python/Project.toml

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ChrisRackauckas

test/downstream/Project.toml

@@ -15,7 +15,6 @@ OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
 PartialFunctions = "570af359-4316-4cb7-8c74-252c00c2016b"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 RecursiveArrayTools = "731186ca-8d62-57ce-b412-fbd966d074cd"
-SciMLBase = "0bca4576-84f4-4d90-8ffe-ffa030f20462"
 SciMLSensitivity = "1ed8b502-d754-442c-8d5d-10ac956f44a1"
 SciMLStructures = "53ae85a6-f571-4167-b2af-e1d143709226"
 StableRNGs = "860ef19b-820b-49d6-a774-d7a799459cd3"
@@ -46,7 +45,6 @@ OrdinaryDiffEq = "6.33"
 PartialFunctions = "1"
 Plots = "1.40"
 RecursiveArrayTools = "3"
-SciMLBase = "2"
 SciMLSensitivity = "7.11"
 SciMLStructures = "1.1"
 StableRNGs = "1"

test/python/Project.toml

@@ -3,11 +3,9 @@ CondaPkg = "992eb4ea-22a4-4c89-a5bb-47a3300528ab"
 DifferentialEquations = "0c46a032-eb83-5123-abaf-570d42b7fbaa"
 OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
 PythonCall = "6099a3de-0909-46bc-b1f4-468b9a2dfc0d"
-SciMLBase = "0bca4576-84f4-4d90-8ffe-ffa030f20462"
 
 [compat]
 CondaPkg = "0.2.26"
 DifferentialEquations = "7.11"
 OrdinaryDiffEq = "6.33"
 PythonCall = "0.9.14"
-SciMLBase = "2"