Bump compat for OrdinaryDiffEq v7 / SciMLBase v3 ecosystem

- docs/Project.toml: OrdinaryDiffEq "6" → "6, 7"
- Main Project.toml already has OrdinaryDiffEqTsit5 "1, 2" and SciMLBase "2.155, 3"
- Sub-lib Project.tomls already have OrdinaryDiffEq "6, 7"

Refs SciML/OrdinaryDiffEq.jl#3562, SciML/OrdinaryDiffEq.jl#3565

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>

Author: ChrisRackauckas

docs/Project.toml

@@ -14,7 +14,7 @@ DataDrivenDiffEq = "1"
 Documenter = "1"
 Literate = "2.14"
 ModelingToolkit = "10, 11"
-OrdinaryDiffEq = "6"
+OrdinaryDiffEq = "6, 7"
 Plots = "1"
 StableRNGs = "1"
 StatsBase = "0.33, 0.34"