Fix container-overflow AddressSanitizer warning in GridFS test code #1431
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Although I am not certain what triggered it locally on my machine (ASAN bounds checks for
std::vector<T>have been present for a long time...?), encountered a container-overflow AddressSanitizer warning in GridFS code due to an improper use ofvector<T>::reserve()(likely to avoid zero-initializing elements?), which this PR replaces with astd::unique_ptr<T[]>andnew T[](preserving default-initialization).