Bump DiffEqBase to v6.177 to test convergence fix

This tests if the partial revert in DiffEqBase PR #1203 fixes the convergence failures in AlgConvergence_III tests that appeared after DiffEqBase PR #1188.

The DiffEqBase fix changes promote_f for SplitFunction to use copy instead of returning unchanged, ensuring proper cache initialization while preserving LazyBufferCache type.

Author: ChrisRackauckas

lib/OrdinaryDiffEqCore/Project.toml

@@ -85,7 +85,7 @@ FastPower = "1.1"
 Logging = "1.10"
 Mooncake = "0.4"
 AllocCheck = "0.2"
-DiffEqBase = "6.176"
+DiffEqBase = "6.177"
 FillArrays = "1.13"
 Adapt = "4.3"
 Reexport = "1.2"