Fix memory allocation error in VEGAS algorithm tests

The "In-Place Batched Standard Integrands" test was failing with:
ArgumentError: invalid GenericMemory size: too large for system address width

Root cause: BatchIntegralFunction was using the default max_batch value
of typemax(Int64), causing the VEGAS algorithm to attempt allocating an
impossibly large array when creating:

similar(prob.f.integrand_prototype, ..., prob.f.max_batch)

Fixed by explicitly setting max_batch = 1000 for the BatchIntegralFunction
in test/interface_tests.jl line 203. This resolves the memory allocation
error while maintaining the intended test functionality.

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: claude

test/interface_tests.jl

@@ -200,7 +200,7 @@ end
         for i in 1:length(iip_integrands)
             for dim in 1:max_dim_test
                 (lb, ub) = (ones(dim), 3ones(dim))
-                prob = IntegralProblem(BatchIntegralFunction(batch_iip_f(integrands[i]), zeros(0)), (lb, ub))
+                prob = IntegralProblem(BatchIntegralFunction(batch_iip_f(integrands[i]), zeros(0), max_batch = 1000), (lb, ub))
                 if dim > req.max_dim || dim < req.min_dim || !req.allows_batch ||
                    !req.allows_iip
                     continue