fix(bazel): add missing load statements

Bazel 9 drops builtin `cc_*` rules, they need to be loaded explicitly now.

test/fptostring_test.cpp

@@ -1,6 +1,8 @@
 #include "yaml-cpp/fptostring.h"
 #include "gtest/gtest.h"
 
+#include <iomanip>
+
 namespace YAML {
 namespace {