Fix one error and all warnings on MSVC 2026

The error is "C1001: Internal compiler error." in uci.cpp on line 370 of
master.  For some reason the compiler can't handle the
std::size(hashfullAges) inside the lambda.  Older MSVC versions had no
problem.

Most of the warnings are due to implicit type conversions "conversion
from type A to type B, possible loss of data"
many of which have been present for a while.

closes https://github.com/official-stockfish/Stockfish/pull/6464

No functional change

src/benchmark.cpp

@@ -454,7 +454,7 @@ BenchmarkSetup setup_benchmark(std::istream& is) {
     int desiredTimeS;
 
     if (!(is >> setup.threads))
-        setup.threads = get_hardware_concurrency();
+        setup.threads = int(get_hardware_concurrency());
     else
         setup.originalInvocation += std::to_string(setup.threads);
 
@@ -486,7 +486,7 @@ BenchmarkSetup setup_benchmark(std::istream& is) {
         int ply = 1;
         for (int i = 0; i < static_cast<int>(game.size()); ++i)
         {
-            const float correctedTime = getCorrectedTime(ply);
+            const float correctedTime = float(getCorrectedTime(ply));
             totalTime += correctedTime;
             ply += 1;
         }