[upstream_utils] Upgrade Sleipnir (#7973)

upstream_utils/sleipnir_patches/0004-Replace-std-to_underlying.patch

@@ -0,0 +1,63 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tyler Veness <calcmogul@gmail.com>
+Date: Tue, 28 Jan 2025 22:19:31 -0800
+Subject: [PATCH 4/8] Replace std::to_underlying()
+
+---
+ src/optimization/problem.cpp   | 9 ++++-----
+ src/util/print_diagnostics.hpp | 6 +++---
+ 2 files changed, 7 insertions(+), 8 deletions(-)
+
+diff --git a/src/optimization/problem.cpp b/src/optimization/problem.cpp
+index 81863808d329a53d4162ce0624a3b8e8afc32dfc..c3319fc0a927cf452871a2db08d5edff87ac8eea 100644
+--- a/src/optimization/problem.cpp
++++ b/src/optimization/problem.cpp
+@@ -7,7 +7,6 @@
+ #include <memory>
+ #include <optional>
+ #include <ranges>
+-#include <utility>
+ 
+ #include <Eigen/Core>
+ #include <Eigen/SparseCore>
+@@ -346,11 +345,11 @@ void Problem::print_problem_analysis() {
+   // Print problem structure
+   slp::println("\nProblem structure:");
+   slp::println("  ↳ {} cost function",
+-               types[std::to_underlying(cost_function_type())]);
++               types[static_cast<uint8_t>(cost_function_type())]);
+   slp::println("  ↳ {} equality constraints",
+-               types[std::to_underlying(equality_constraint_type())]);
++               types[static_cast<uint8_t>(equality_constraint_type())]);
+   slp::println("  ↳ {} inequality constraints",
+-               types[std::to_underlying(inequality_constraint_type())]);
++               types[static_cast<uint8_t>(inequality_constraint_type())]);
+ 
+   if (m_decision_variables.size() == 1) {
+     slp::print("\n1 decision variable\n");
+@@ -362,7 +361,7 @@ void Problem::print_problem_analysis() {
+       [](const gch::small_vector<Variable>& constraints) {
+         std::array<size_t, 5> counts{};
+         for (const auto& constraint : constraints) {
+-          ++counts[std::to_underlying(constraint.type())];
++          ++counts[static_cast<uint8_t>(constraint.type())];
+         }
+         for (const auto& [count, name] :
+              std::views::zip(counts, std::array{"empty", "constant", "linear",
+diff --git a/src/util/print_diagnostics.hpp b/src/util/print_diagnostics.hpp
+index fde36957c0258f6e3cd435ef6224d60407012ff7..82e0e082b0e40153dcb2fcd2c655a412a8a9540a 100644
+--- a/src/util/print_diagnostics.hpp
++++ b/src/util/print_diagnostics.hpp
+@@ -238,9 +238,9 @@ void print_iteration_diagnostics(int iterations, IterationType type,
+   slp::println(
+       "│{:4} {:4} {:9.3f} {:12e} {:13e} {:12e} {:12e} {:.2e} {:<5} {:.2e} "
+       "{:.2e} {:2d}│",
+-      iterations, ITERATION_TYPES[std::to_underlying(type)], to_ms(time), error,
+-      cost, infeasibility, complementarity, μ, power_of_10(δ), primal_α, dual_α,
+-      backtracks);
++      iterations, ITERATION_TYPES[static_cast<uint8_t>(type)], to_ms(time),
++      error, cost, infeasibility, complementarity, μ, power_of_10(δ), primal_α,
++      dual_α, backtracks);
+ }
+ #else
+ #define print_iteration_diagnostics(...)