[C++ SDK] Added forgotten Reserve replacement in TExportClient (#27183)

Author: Gazizonoki

.github/last_commit.txt

@@ -1 +1 @@
-fec82809617b3cc3eaf47995d02287945e9ef8b0
+42606baa568dd1f0408b0651dce31577f28bcfe1

src/client/export/export.cpp

@@ -29,7 +29,8 @@ const std::string TExportToS3Settings::TEncryptionAlgorithm::CHACHA_20_POLY_1305
 namespace {
 
 std::vector<TExportItemProgress> ItemsProgressFromProto(const google::protobuf::RepeatedPtrField<ExportItemProgress>& proto) {
-    std::vector<TExportItemProgress> result(proto.size());
+    std::vector<TExportItemProgress> result;
+    result.reserve(proto.size());
 
     for (const auto& protoItem : proto) {
         auto& item = result.emplace_back();