Fix clang check

Signed-off-by: NeaguGeorgiana23 <neagugeorgiana@google.com>

Author: NeaguGeorgiana23

include/openfeature/openfeature.h

@@ -3,6 +3,7 @@
 
 #include <chrono>
 #include <memory>
+#include <shared_mutex>
 #include <string_view>
 
 #include "openfeature/client.h"

src/test/resolution_details_test.cpp

@@ -9,7 +9,8 @@ TEST(ResolutionDetailsTest, AccessesFieldsAfterInitialization) {
   const Reason expected_reason = Reason::kTargetingMatch;
   const std::optional<std::string> expected_variant = "on-variant";
   const std::optional<ErrorCode> expected_error_code = ErrorCode::kParseError;
-  const std::optional<std::string> expected_error_message = "Failed to parse data";
+  const std::optional<std::string> expected_error_message =
+      "Failed to parse data";
 
   const FlagMetadata expected_flag_metadata{};